Delta Halo (Level)

''Looking for Installation 05?

Delta Halo is a Halo 2 campaign level. After helljumping in Halo in an HEV, the Master Chief fights his way through Covenant forces to reach the temple where the Prophet of Regret resides. This is the only level where you will be aided by ODSTs and is also the first level you fight Honor Guard Elites.

Usable Weapons

 * Battle Rifles
 * Particle Beam Rifles
 * Covenant Carbines
 * Energy Swords
 * Pistols
 * Needlers
 * Plasma Cannons
 * Plasma Pistols
 * Plasma Rifles
 * Rocket Launchers
 * Shielded Plasma Cannons
 * Shotguns
 * SMGs
 * Sniper Rifles
 * Fuel Rod Guns

Vehicles

 * Ghosts
 * Scorpion Tank
 * Warthog
 * Wraiths
 * Banshees (non-drivable)
 * Phantoms (non-drivable)
 * Pelicans (non-drivable)

No Enemies
At the starting of the level when you hold the Temple with the Helljumpers where the Jackal and the Grunt were in the cinematic, climb up the hill, walk around until it says Loading...done. After that, go somewhere low that you can get to the ground without dying. There will be no enemies for the whole level, but you'll also be unable to get to the next level because a door will be locked. Also, all holograms of the High Prophet of Regret will just be of his Gravity Throne, no High Prophet of Regret sitting in it.

ODSTs vanish
When you reach the temple where you must clear a Landing Zone for the Pelican/drop pods, after you eliminate all enemies that exit the temple, about half the time all surviving ODSTs (only a maximum of 3) will suddenly vanish. Rarely, only one or two will vanish. The Marine reinforcement(s) will never disappear, only the Helljumpers.

Delta Halo
{a Slipspace rupture in space, the Covenant Assault Carrier comes out, followed by some debris from New Mombasa and In Amber Clad}

{interior of In Amber Clad}

Commander Keyes: (lurches forward, grunts) "Report!"

Crewman 1: "Both engine cores have spun to zero. We're drifting."

Crewman 2: "Archer pods are cold. I'll need to re-key the system."

Commander Keyes: "Do it, and find out where we are."

{pan over ODST pods}

Cortana (O.S.): "Sorry for the quick jump, Sergeant. You in one piece?"

{Johnson's in a pod, he smokes a smashed cigar (possibly due to the "Jump")}

Sergeant Johnson: "I'm good. Chief?"

{shot of Master Chief in another pod}

Cortana: "We're fine."

{on the bridge}

Crewman 1: "Ma'am, there's an object. Coming into view now."

Commander Keyes: (stares in amazement) "Cortana, what exactly am I looking at?"

{In Amber Clad heads toward Delta Halo}

Cortana: "That ... is another Halo."

Sergeant Johnson: (chokes) "Say what?!"

Commander Keyes: "So this is what my father found ... " {gazes at Halo} "I thought Halo was some sort of superweapon."

Cortana: "It is. If activated, this ring will cause destruction on a galactic scale."

{in the pod, Master Chief looks at Halo on his viewscreen}

Commander Keyes: "I want all the information you've got on the first Halo. Schematics, topography, whatever. I don't care if I have the clearance or not."

Cortana: "Yes, ma'am."

Commander Keyes: "Where's our target?"

Crewman 2: "The enemy has stopped above the ring, ma'am. We're going to pass right over it."

Commander Keyes: "Perfect. Given what we know about this ring, it's even more important that we capture the Prophet of Regret. Find out why he came to Earth, why he came here. Chief, take first platoon. Hard drop, secure a landing zone. Sergeant, load up two flights of Pelicans and follow them in."

Sergeant Johnson: "Aye aye, ma'am."

{Johnson exits his pod}

Commander Keyes: "Until I can move and fight I'm going to keep a low profile. Once you leave the ship, you're on your own."

{Johnson knocks on the hatch of Master Chief's pod as he is walking by, Master Chief pounds back}

Master Chief: "Understood."

Crewman 2: "Over the target in five..."

Cortana: "Hang on to your helmet!"

{the pods drop, they helljump to Halo}

Cortana: {as the parachute deploys} "Mind the bump."

''{On Halo, a Grunt and a Jackal notice the pods. The Jackal flicks his wrist, and his energy shield snaps on. The Grunt boards a plasma cannon and shoots at them, soon another  plasma cannon starts firing. The pods land, Master Chief comes out of one, scanning the area with an SMG. If you look very closely on Legendary, you will see that the Grunt is playing with Master Chief and Grunt action figures. If you play Heroic, the Grunt appears to be making a campfire.On normal the Grunt will be playing with a plasma grenade, and on easy, the Grunt will be playing with the dirt.''

Cortana: "Could we possibly make any more noise?!"

{Master Chief picks up a Rocket Launcher}

Cortana: "Hmm. I guess so."

Helljumpers
{they come under fire of the Shielded Plasma Cannon}

ODST: "Sir, we gotta neutralize those turrets!"

ODST Sergeant: "Clear this landing zone! The Pelicans are right behind us!"

{When Master Chief takes out all Covenant in the area}

Cortana (O.S.): "Artillery disabled, Sergeant. Landing zone secure ... for the moment."

Johnson: "I hear ya. Starting our approach. Hang tight."

Cortana: "Easier said than done. Inbound Phantoms Chief."

''{Phantoms drop off troops. Master Chief kills them}''

Cortana: "Another Phantom on approach."

''{Second Phantom drops off troops. Master Chief kills them}''

Cortana: "Hold here until the Pelican arrives, Chief."

{If you stay and wait for the Warthog}

ODST or Cortana: "Here comes our ride."

{Pelican arrives, dropping off 2 Marines and a Warthog}

{If you proceed up the path without waiting for the Pelican to arrive}

Cortana: "Let's wait here until our Warthog arrives ... unless you prefer to walk."

Sergeant Johnson: "I got a good view comin' in. There's a big building in the middle of this island's lake."

Cortana: "I saw it too. It looks like a temple. If I were a megalomaniac, and I'm not, that's where I'd be."

{Pelican drops Warthog}

ODST Sergeant: "Saddle up! We're movin' out!"

ODST: {gazing at vast scenery after killing Jackal Snipers} "Whoa... it looks like a postcard! {quotes his imaginary postcard}

 same ODST as above: Dear Sarge,kicking ass in outer space,wish you were here!"

Sergeant Johnson (O.S.): "I heard that... jackass!"

{Later, you come across a bridge held by the Covenant}

Cortana: "The Covenant have control of the bridge ahead. They're going to try to bottle us up on this side of the gorge. The controls to extend the bridge should be in this structure."

ODST or Cortana: "Watch out, Chief! Wraiths on the far side!"

{After extending the bridge}

ODST or Cortana: "Good, the bridge is down. Now about those Wraiths..."

Sergeant Johnson (O.S.): "Roger that. Armor's on the way."

{If you stare at Regret's Hologram then walk up to the ODST}

ODST: "Isn't that our target? What's he doing? Giving a speech?"

Cortana: "A sermon, actually. I've been listening to it since we landed. So far, some standard Covenant literature, but I'll translate if he says anything interesting."

(Or If you just keep staring at the hologram)

Cortana: "Regret's giving a speech, a sermon, to be exact. So far it's the standard Covenant liturgy but I'll translate If he says anything interesting."

{Another Pelican approaches, carrying a Scorpion Tank}

{If you choose to go on foot, Warthog, or Ghost} Cortana: "You don't want the Tank? Ok, we'll leave it for the others."

{You pass through a multitude of Forerunner ruins}

You Break It, You Buy It
Cortana: "Careful. We're coming up to another structure."

{During the attack on the structure}

ODST: "We got a Pelican coming in! Let's clear a landing zone!"

or

Cortana: Pelican, inbound! Lets clear a Landing Zone!"

{After the Pelican drops some weapons, more Covenant arrive}

ODST or Cortana: "They're all pouring out of the middle! Let's get in there."

{Once the outside is clear}

Cortana: "The Covenant are holed up in the middle of this structure. We need to clear them out."

{As you progress into the building, you come across a hologram of the Prophet of Regret}

Prophet of Regret: "In a gesture of peace and reconciliation, the Prophets promised to find the means of the Forerunner's transcendence, and to share this knowledge with the Elites. The Elites promised to defend the Prophets as they searched. A simple arrangement, that has become our binding Covenant!"

Cortana: "Transcendence, huh? More like mass-suicide."

Off The Rock, Through The Bush, Nothing But Jackal
{Later, you find more Covenant near a waterfall flowing into a creek}

Cortana: "You always bring me to such nice places."

{After that, you reach a massive temple}

Cortana: "Good, still no word about In Amber Clad on the Covenant battlenet. It's odd, the Covenant knew we made landfall, but they don't seem to consider us a very serious threat. Boy, are they in for a big surprise."

{As you enter the temple, you find two Elites in Honor Guard armor, standing next to another Regret hologram}

Cortana: "Watch yourself! Honor Guards!"

{After Elites are killed, the level ends}

Walkthrough on Normal
Objective: Clear the Landing Zone for the Pelicans. Easy, right? WRONG!!! You have several squads of Covenant to polish off before you can even think about your objective, so prepare to get your gauntlets dirty.

Part 1: Helljumpers
As the level starts off, head past the ODST in front of you, up the hill, and switch to your Launcher. Target the Plasma Turret on the ledge directly above/ahead of you, and blow it sky high. Now, switch to your SMG and burn the Grunts that come charging our from under the ledge. Two Jackals are probably rushing you and your team, so I would suggest a frag grenade and repeated doses of SMG fire to get them out of your way. After they're dead, switch back to your Rocket Launcher, and destroy the remaining Turrets. You should still have four rockets remaining. As the music starts, the aforementioned crapload of Covies will charge out of the large structure. Quickly toss another Frag or two to clear out the Grunts/Jackals, then center your SMG fire on the Elites; they should fall quickly. Beware, as there is a Sniper Jackal on the structures second level, so I would suggest requisitioning a Battle Rifle to bring him down. Do not charge up the middle, but go to the buildings entrance on the far left. Two more Elites and a squad of Grunts will spawn to try and end your career, so you should probably grab your SMG and dual wield it with the nearest weapon (I suggest the plasma rifle) to thin their ranks. Once they are RIPing, congrats. You just finished the first fight of the level.

However, there is not time to relax, as two Covenant Phantoms are closing on your position. Get you and your ODSTs inside the building now, and quickly stock up on ammo. There is a Rocket launcher cache on the very top of the structure, so go ahead and grab that. If you feel generous, go ahead and arm your men with a Beam Rifle or other assorted Covenant small arm, but just be sure to keep your SMG/ Rocket Launcher. (Note: If your Submachine Gun runs out of ammo, go ahead and grab a Covenant Needler/Plasma Rifle/Carbine. After all, resupply is just one victory away...)

As the first dropship comes rolling in, whip out your Launcher, target, and destroy the two plasma turrets that are firing at you. The third shouldn't open fire, but have a rocket ready if it does. Your squad will target the Grunts that come a-calling, and will occasionally kill one or two, but when these Covenant, plus the Elites and Jackals that supports them, hit the ground, have two grenades ready for them. If the grenades don't kill all of them in the blast, hunt down the stragglers with your SMG.

When the second dropship comes into view, target all three of its turrets (you should have one rocket left in your launcher) Objective: Extend the bridge and cross the chasm. You'll now reach a building with a couple of wraiths across the Bridge. That is, the one that's not there yet. Shoot all the opponents outside the temple with your BR. Be careful, as there are ghosts and turrets. Move slowly, and aim for fuel tanks on the Ghosts, and heads on the turrets. Pull out your Sword when everything is dead, run in the building, and gut everything in your way. Now lower the bridge. Hit the button to do so...but you knew that. Right? The Wraiths will still be bombarding you, so wait while the Pelicans come again. A Scorpion will be dropped off behind the building. Why can't we just fly to the temple? Ah well, go ahead and hop in the tank. Blow the Wraiths and Ghosts up, along with the occasional Banshee.

Objective: Push through the Covenant-held ruins. Easy enough...just don't let ghosts shoot your tank in the back. Drive through the caves and run over anything in your way, while sending other aliens sky-high. You'll eventually reach a large open ruin, with a bunch of shields inside it the courtyard next to a fountain. Blow everything up from inside the tank, hop out, and continue on foot. NOTE: If you want, you COULD squeeze the Scorpion through and use that. If you do, just blow up the ghosts with your shells, blow up aliens with your shells, and blow up turrets with your shells. You'll reach ANOTHER set of ruins. There's also a lot of Ghosts. Be careful not to get run over, and hijack a Ghost. Now, use it to blow up the rest of the ghosts and clear the ruins. Eventually, you'll find a small area that is littered with defense shields. Hop out of the ghost and wait for a Pelican with weapons. Pick up a Sniper Rifle and more ammo for your BR. Head forward and shoot or beat down any Aliens in your way. Now we get to a small room, filled with aliens. Stick the Elites and use frags for Jackals. Head forward, and look for a hole in the wall. You'll reach a nice waterfall, with a stream. There's a jackal with its back turned to you. Hit it in the head, and spray the stream with purple blood. DO NOT SHOOT THE JACKAL. There's lots of snipers here, and they don't know you're here yet. Crouch down where the sniper was, pop out your Sniper Rifle, and shoot anything you can see that's moving. Once you've killed everything or are out of ammo, turn right and go down to the log. Cross it, and turn right. A bunch of buggers will assault you. Clear them up with your BR, and go up the small hill. Turn right again, and you'll see a cave with a few elites in it. Slaughter them and head forward.

Objective: Reach the Towers in the Lake. This isn't a "new" objective, but it's the one we'll fulfill here. You'll see a small canyon, leading to a sort of...dockish place. Waste anything in the way, and head forward to the weapon canisters. Stock up on BR ammo, and head forward. A bunch of Elites wearing glowing orange armor will be in the Temple. Assassinate the first one, who has a Sword. Swap your sniper for the sword, and head into the main chamber. Three honor guards will be waiting there. Use a series of continuous jump lunges and kill them. Remember to target swords first, because you will be slaughtered if you don't. Once you've cleared out the honor guards, the level finally ends. On to Regret!

Heroic Walkthrough
Part 1: Helljumpers

As the level starts off, you'll hear the Australian ODST (or Helljumper, whichever you prefer) tell you that those plasma turrets need to be destroyed. Start off by switching to your Rocket Launcher and charge up the path directly in front of you, then turn 180 degrees, and look up at a 45 degree angle. You should see the first of three turrets that you need to destroy. Lock on to it, and send a 102mm SC-HE greeting to the Covenant Grunt. As soon as you do, switch to your SMG, and hose down the three Grunts on you right side. Proceed up the side of the cliff, always keep an eye on your footing, and help your allies mop up the two Jackals on the scrub in front of you. Whip out your launcher, target, and destroy turret number 2, then (assuming your facing the structures) turn to your immediate left, and nail turret number three. As soon as thats done, get next to the drop pod, and exchange your SMG for the conveniently placed BR. As the music starts, an ungodly crapload of Covenant infantry will burst out of the structure. Use the optical scope on your Battle Rifle, and quickly target any Jackals or Grunts that come up to say hello. A Jackal Sniper will spawn at the top of the structure, so use your rifle and paste him, or prepare to turn in the warranty on your life. As soon as the Jackal Sniper is dead, head back to the spot where you knocked out the first turret, and go under the natural arch to flank the enemy. You should come right up on the remaining assault force, who are busy trying to kill your squad. Use your rifle and Frag Grenades to take out the Grunts/Jackals, then zoom in with your scope and target the two Elites on the far side of the ridge. They should go down pretty easily. If your finding yourself low on Battle Rifle ammo, then I would suggest exchanging it with the SMG next to the drop pod you encounter as you exit the arch. Find a Plasma Pistol (PP) to complement it, then prepare for the next assault force to come out. Feed those Covies a frag as they jump out of the main entrance, then grab your PP, overcharge it, and stun the first Elite you see. Hose his ugly face with 5mm caseless rounds, then switch your fire to any bad guy still alive. As soon as their down, exchange your PP for a Plasma Rifle (PR), reload your SMG, and head inside the structure. More likely than not, two more Elites plus a complement of Grunts will appear, so be ready for some backpedaling, full auto fire, and grenading like crazy. If you're lucky, they wont spawn, and you'll be free to scrounge for ammo. There's a Beam Rifle in a shadowy little corner where you counter-sniped the sniper, and there Rocket missiles on the top of the structure for your taking. If you still have your BR from the beginning, then give it to the ODST with the SMG (it increases your overall firepower/kill ratio), then pick up the Beam Rifle. Weapons check now: Beam Rifle, Rocket Launcher, Frag's, and whatever Plasma Grenades you picked up during the battle. As the dropship comes into view, feel free to target and destroy two of its turrets (two maximum; it almost never fires the third). Because you'll be ditching your SPNKR launcher very soon, feel free to use as many missiles as you want (so long as you have one left at the end). When the ship drops the enemy reinforcements, whip out the Beam Rifle, zoom in, and target the nearest enemies. I recommend sticking with the Grunts and Elites, because the former will throw deadly grenades, while the latter have deadly Carbines that will kill your team rather quickly. If things prove too dicey, then switch back to your launcher and send a volley of rockets (along with grenades) down to disrupt the enemy forces. As the dropship flies away, move down to the drop zone, and clean out any stragglers that may be lurking around. Swap the Beam Rifle out for an SMG/PP combo, reload your Rocket Launcher, and get back into position. Dropship number two is inbound. It should be noted that this dropship will fire all three of its plasma cannons. Now, this would be a problem if the dropship was a Blackhawk chopper, its plasma cannons were M134 Miniguns, and you were cemented to the ground. But as it is, they're not, you're not, and I've found that constantly moving around is enough to simply ignore the cannons. When the enemy forces drop in, spam 'em with a few frags and ready your dual weapons. Eight out of ten times, an Elite with a sword will drop along with the rest of them, so target him first. When he's dead, help your Helljumpers kill the remaining Elite, along with Grunts/Jackals. Once they're all dead, you can consider yourself done. With luck, two of your allies should have survived. As the Pelican comes in, scrounge around for ammo. Pass off your Rocket Launcher to one of your allies, then stock up on Battle Rifle ammo, along with any secondary weapon you want. When the dropship gives you a Warthog, climb into the driver's seat, and wait for your allies to follow suit. It is necessary that the ODST (or Marine, if all of your original squad is KIA) armed with your Rocket Launcher gets in the side seat, because he will provide the invaluable anti-armor fire. With that done, drive up the narrow path, allow your gunner to clear away the sniper Jackals that guarded the exit, then continue on until you hit a ridge overlooking yet another Forerunner sructure. Listen to Cortana go on about the bridge controls, then head down to engage the enemy only after you get a checkpoint. There are roughly three plasma turrets, half a dozen Elites, two Jackals, and a couple of Grunts, along with four Ghosts that you need to scrub before you can lower the bridge, and the turret placement is generated randomly by the game. Adding to your frustration is the Covenant Wraith tank that will try to disintegrate your 4x4, which means your going to have to continually drive around the structure, while your gunner and your passenger try to eliminate the opposition. (This is actually easier than it sounds. Just keep driving.) Once everythings dead, park your Hog in the back of the structure, get out, and mozy on in. When you reach the control room, use any method of execution to kill the guards (1 Elite, 4 Grunts, 1 Jackal), then activate the bridge. Proceed back outside to receive your M808B MBT to destroy that Wraith.

Weapons Caches
Hidden ODSTs (Orbital Drop Shock Troopers) on Delta Halo

Hidden ODST with Sniper Rifle: Hidden ODSTs with Rocket Launchers:
 * A hidden sniper cache is at the end of the level before you go into the building with the Elite Honor Guards. In the small clearing where there is several pods of ammo you should see a collapsed doorway. Grenade jump on that and turn left. You should find a dead ODST hidden in the bushes along with a Sniper Rifle.

1.There is also another one at the beginning. In the first area, with the turret on a hill, and a two-story structure. Go to the top level. you can either go through the inside and up the ramp, or on the ramp on the outside. To the right of the room you are in, there is a ledge that you can walk on. Go there, then turn around 180 degrees. You should see the roof of the room you were in above you. Jump on top, using a crouch jump or grenade jump. To your right, you should see the area where the combat is (or was) taking place. Walk forward a little, and turn toward your left. You should see a dead ODST, with a rocket launcher and ammo next to him.

2.	In the landing installment of the level, (The first part.) go to the structure in the back and go as high as you can go by the stairs. (You'll find a beam rifle up in that room.) Go on the balcony and turn to your right. You'll see a ledge, jump on that ledge and jump up again. Another ledge is up there, jump onto it and look to your left. A dead ODST will be lying in the alley next to a rocket launcher and two fragmentation grenades.

3. In the installment: You Break It, You Buy It, where there are sererval of ghosts and turrets, face the place where you are supposed to go and turn right. Go forward and you'll come across a low ledge. You can either grenade jump on it or hop on a tank or warthog and turn left. You'll see a bunch of vines and inside them is a dead ODST with a rocket launcher and two fragmentation grenades lying next to a drop pod.

4.	In the installment where you have to enter the structure where a pelican will arrive, go to the very back right of the area in a tank. You'll see a low ledge but not low enough for you to jump on. Jump on the tank and jump from there to the ledge. Jump on top of the second ledge and follow the path. At the end is a fallen pillar. Jump onto the block the pillar is lying on and edge around it. Jump down and look under the pillar. A dead ODST is lying there with a rocket launcher and two fragmentation grenades.

Hidden ODST with two magnums:

1.	On the part with the sniper rifles and the waterfalls, somewhere in the back part is a cave where Covenant pour out of. Get inside the cave and at the end is a dead ODST with two magnums and two fragmentation grenades.

Hidden ODST with sniper rifle:

1.	At the end when you're approaching the temple structure with the honor guards are, face the structure and look behind you. There's some type of doorway. Jump back to where you came from and jump onto the doorway thingy. Go to the end where those vines are and inside the vines is a dead ODST with a sniper rifle and two fragmentation grenades.http://faqs.ign.com/articles/722/722912p1.html 2. There is also a marine with a sniper rifle in part of delta halo which is also part of regret, where there are sleeping grunts and a couple of elites

Blast Yourself Over the Bridge
After Cortana says "The controls to extend the bridge should be in this structure.", drive your Warthog onto where the bridge extends. When the Wraith comes out and shoots at you go forward VERY slightly so that the Wraith shot will hit the back of the 'Hog. You will go flying over the gorge and land on the other side. However, even on Easy, you will die upon impact of landing.

Or, for a better view, after the Wraith hits the back of your Warthog, get out of it. You'll die the moment you get out, but you'll get a much better view, and sometimes, you'll fly over the next structure.

If you are in a Ghost, and haven't yet extended the bridge, if you go where the bridge would be, and the wraith's mortar hits you, its possible that you will be flung over the gorge, and hopefully stay alive. You can continue the level if this happens. (However, you cannot go back for the Tank, and you won't have any help until you get to the area with the plasma shields.

Wandering the mountains
At the beginning of the level, go up the right hill, until you get to the top, where a group of grunts will start to shoot at you. Kill them or just ignore them (although you might get killed if you're too slow), and go towards the hill leading up towards the turret. climb it, and when you get to the top, destroy the turret. Now continue in the direction you were going in when you climbed the hill. In a little bit, if you look down, you'll see that the land comes to a corner. If you go right to the edge, you can see land on the other side. Jump over the edge, aiming for that other area. Now turn towards the top of the hill, and move forward while constantly jumping. When you stop sliding down every time you land from a jump, you can just walk to the top. When you do, you'll see what looks like plains, which lead up into the mountains farther ahead. If you look around, you'll see a huge lake, and a mountain range surrounding it. That's all yours to explore! If you walk ahead for a few minutes in the direction of the large mountains you saw earlier, you'll see a square where the ground should be. Don't get too close, because if you fall in, you'll die and have to start the whole thing over. Also, when you get to this point, if you turn away from the area where you would normally be playing, you'll notice what looks like another lake, but in this one, you can walk around in it and you won't die.

This can also be done with the ghost, except instead of jumping over the edge and up the hill, just turn towards the top of the hill, and move the left thumb stick right so you move to the right. When you get over the edge, hold down the left trigger until you get to the top. This makes it much easier as you can get down the larger mountains without dying, and lets you move faster.

A third method is to play through the level normally until you get to the part where you have to lower the bridge. Instead of destroying all the ghosts, leave one, and take it. Now go back to the part where the jackals were waiting for you. Face the trail you followed to get here, from the beginning. On your left should be the trail to where you got the ghost from, and on your right is just a very steep hill, and one end of the mountain range. Maneuver your ghost onto the nearby rocks, and then boost up the hill. If you make it, you can ride around the whole mountain range. An interesting thing is that if you go towards the edge of the mountain, you will see a part where the mountain just stops. It is an invisible wall, and it acts just like any other wall. Riding around the mountains like this in co-op is a great strategy, as one player can play normally, while having the other player snipe, although to get more ammo, you have to go all the way back to the beginning, and back to your sniping position. For more information, go to Delta Halo Vacation or Halo 2 Glitches and Tricks, and then "Vacations", for other places you can do something like this.

The fourth way is by going through the level as normal and wait until the pelican drops the scorpion, get on and go across the bridge, when you get to the part you break, it you buy it, turn left and there should be a hill where the dead ODST is at get up there, then you will see the mountains in front of you and you get to climb them.

The Gate
It is possible to enter the next levels (Regret) map without activating the cut scene. The Sputnik Skull is REQUIRED for this glitch. First, go through the level on any and I mean ANY difficulty until you reach the part where you are on the bridge with the Weapon Pods that the In Amber Clad dropped for you. Instead of going into the tower, grenade jump on the side of the entrance to the platform above. Kill all the Jackal Snipers. Then, find your way around and jump down. You will be on the other side. There will be Covenant soldiers with most of the Grunts sleeping. They will act as if you were not there unless you bump into them, in which the notice you presence, but does not shoot, melee, or have any idea what is going on. The Elites would usually charge at you but rush right past you and continue to the end of the path. Most of the time they won't melee you, but if you bump into them too much, they will melee. Continue to where the gondola is and you will see what appears to be a Zanzibar gate switch hovering off the coast of your platform. Many think activating this switch will do something, but it is clearly a glitch and placed there accidentally.

2 Dead Grunts, 2 Hidden Swords
At the You Break It, You Buy It section, when entering the second middle section (the one after the are you enter the middle section into with the Prophet hologram), go to the left side and look towards the side you cam in from. There should be an angled section. Crouch jump onto this then walk along until you hit the invisible wall. Grenade jump onto the ledge above you. Do a 180 and jump on to the top. Move to the right hand edge and look down. You should see a ledge below you with a door/hole in the wall. Jump down to here and go in. There should be the bodies of two Grunts and two Energy Swords. It is odd that two Grunts died with Energy Swords, since Unggoy are not allowed to use them. One possible scenario is the two Grunts got their hands on a couple of Energy Swords, and hid behind the large rock with them. The pair then proceded to kill themselves with the swords, due to their ignorance in the use of Energy Swords. This is also a floor lower to the one where the invisible Elites that guard the Envy Skull dwell.

Rocket Launchers
There are two hidden rocket launchers on the level Delta Halo. The first one is located in the very beginning of the level. Walk inside the temple, and up the stairs. Melee the Sniper Jackal, and head right. You should be able to jump up on the roof. When you have succeeded, head right again. Look left, and you should see a dead ODST, and a full Rocket Launcher.

The other one is a bit trickier to find. Continue through the level until you come out of the first tunnel with the Scorpion. There should be an open area with Ghosts, turrets, etc., and there should be lots of Jackals. This is also the area where you can get out of the level. Go to the right, and drive into the wall. You should be able to climb it with the Scorpion, or with a Ghost. But after scaling the wall, stop and do NOT continue up the mountain. Continue walking along the perimeter of the area. You should find a dead ODST near a drop pod, with a Rocket Launcher.

Skull
The Envy Skull is found on this level.

Note, this is also similar to the Hidden Sniper Rifle, which can also be found on Delta Halo. Near the end of the level, after the area with the waterfall and snipers, you will go through a tunnel and come out onto an open ledge. There will be several buildings in the distance and if you still have a sniper rifle or beam rifle, you can pick off several Grunts, Jackals, and Elites. Below the ledge you are standing on is the main ledge which has weapon drop pods, however if you turn right and go along the wall, you'll reach a point where you can jump up and walk along above the main ledge. This will deposit you on a hidden ledge covered in thick vegetation. On the ledge is a dead ODST and a sniper rifle.

Hidden ODSTs
If one pays close attention at the opening cinematic on the level Delta Halo, it can be seen that all the HEV pods but one have landed in the immediate area. But there are only three ODST's that survived the landing. Once the chapter "Off The Rock And Through The Bush, Nothing But Jackal" is triggered, look for a cave. Turn on your flashlight and keep going in it until you find a dead ODST that had dual-wielded Magnums. It was probably the two Jackal Snipers and the Elite that walks out of the cave that killed him. It is surprising that he made it as far as he did. Sometimes you can hear his screams.

There are also five other "Lost ODST" troopers in the level. One is in front of the temple to the far right (next to the stair case), another is on top of the temple at the beginning of Delta Halo, with a Rocket Launcher nearby. One is on an overlook by the Forerunner temple where you are given the Scorpion. He had a Sniper Rifle. The next is in the Forerunner courtyard where you fight turrets, Jackals and Ghosts from the Scorpion. He has a Rocket Launcher. The final one is near the end of the level, opposite the last temple you enter near the drop pods filled with ammo. Again, this ODST had a Sniper Rifle.

Trivia

 * In the opening cutscene, behind Miranda Keyes in the bridge of the In Amber Clad, screens can be seen with ODP's on them, this is also seen on Elongation The Armory and in the Cairo Station level.
 * This is the first level where you meet the ODSTs (Orbital Drop Shock Troopers) and the only level in Halo 2 that you can "play" with them (with "play" I mean, they're in your team, do whatever you want with them).
 * In the cutscene at the beginning of the level, the Grunt that sits near the turret has three different animations on higher difficulties. On Normal, if you look closely the Grunt is playing with the dirt. On Heroic, the Grunt is seen playing with fire. On Legendary, the Grunt is seen playing with a Master Chief action figure and a Grunt action figure.
 * In the first cutscene you can see chunks of the skyscrapers from New Mombasa. They aren't really detailed, though.
 * The Envy Skull is found on this level.
 * Provided that you play your cards right, you can get a Marine to drive the Warthog when you drive the Scorpion, or vice versa.
 * The birds flying around (at the beginning where the Wraiths are) can be killed with a Beam Rifle, Battle Rifle, or a Covenant Carbine; and they will explode into a blur of red blood and die. There are more of this birds at the level Regret.
 * Originally, Bungie had planned for the level to begin while the Master Chief was still in the Orbital Drop Pod. Two Pelicans would fly by a window in the pod, which the player would have to save from the turrets seen in the opening cut scene. However, this feature was cut due to bugs and a time shortage.
 * There are three hidden Rocket Launchers in this level; one on the top of the first structure, which to get to you have to go to the balcony, look to the right, walk on the side of the structure, then crouch jump on top. The second is at the part where it says "you break it, you buy it. Go to where the swirling ramp is and try to park your scorpion in a way that you can reach the ledge with the trees. in the trees, there will be a dead ODST with a rocket launcher.The third one is at the structure where the first pelican drops in reinforcements. You have to go to the corner that is trough the tunnel of where the envy skull is. You have to grenade jump up that corner, walk across the "balcony", and look to the left after the giant piece of broken wall. There is a marine corpse with a rocket launcher.
 * This is the only level in the series besides Halo that you start with a rocket launcher.
 * Using the Sputnik skull it is possible to jump into Regret and find 'The Gate'. The gate is a switch located where the first Gondola would arrive. Upon opening it you will hear the noise the Gondola makes when you start it up. It has been highly controversial between Halo fans because no one knows its purpose although it is most likely to be a place holder for the Gondola itself. Note: You need the Sputnik skull to propel yourself with explosives to reach it.
 * All of the Grunts using the shielded turrets have Plasma Rifles on this level.
 * You can see the Sentinel Wall in the distance, implying that the area is pretty close to the Library.
 * There is a Tri-gate outside the level.
 * This is the last level where the Master Chief will have the opportunity to drive a vehicle.
 * In the cutscene where you see the HEV pods fall to Installation 05, during the part where you see Chief's pod with flames all over it caused by friction (just before Cortana says, "Mind the bump,") you can see a continent which looks VERY much like Africa in the background.
 * The player has 5 opportunities to wield an Energy Sword in this level. The last Phantom to drop off reinforcements drops an elite with a sword. When you reach the structure where a pelican drops off weapons and marines, go to the building nearest the ocean. You will see an entrance blocked off by a block. if you jump atop this building and go through the side entrance, you will find 2 energy swords and 2 dead grunts. When you reach the waterfall, follow the stream all the way down and you should find a sword. The last one(s) are in the hand of a Honor Guard at the end of the level.
 * If you kill the first three Honor Guard inside the building, the beginning cut-scene for Regret will begin. If any are killed outside it (such as on the long ramp), a fourth one will be on the second level, to the right (This one has a Plasma Rifle).
 * If you get a ghost to the end of the level, and then dis mount from it with pointing out through the doors of the final room, the honor guards will ignore you and mount the ghost making them easy targets and will ignore you as long as the ghost cannot be turned and you stand to one side of it.
 * At the beginning of the level, you clear the Covenant from the first structure, then move on to the bridge area, and get the Scorpion. If you do this, the game will act as if you did not go get the Scorpion, and the game spawns a warthog. Cortana will also say "Lets wait for the warthog, unless you'd rather walk" on your way back through with the tank.
 * It is possible that Sergeant Stacker and Sergeant Banks appears as both an ODST and a marine in this level.
 * For the first time in the game, you can see a jackal using a Plasma Rifle against you.
 * When you have cleared the landing zone and the Pelican has arrived with a Warthog and two Marines, you can hear a song that doesn't appear on the soundtrack.
 * On Legendary there are usually 4 or 5 Jackal Snipers that will try to kill you after you get the Warthog.

Images
 Image:Ship3.jpg|Regret's Ship Comes Out Of Slipspace. 