A player beneath a base floor.
When playing Halo 3's Multiplayer map Snowbound on Forge, it is possible to go through the ground into a blue room hidden underneath a glass floor inside one of the bases.
Turret Method[]
To perform the glitch, a player must first overload the map with Trip Mines.[citation needed]
From there, they (Person A) must go to the base with a room under the floor. They will need to bring a friend (Person B) with them. The two will perform a variation of the Forge Turret Glitch.
Person A, in Edit Mode, should spawn a Plasma Cannon or a Machine Gun Turret and set it down. Person B, in Player Mode, should man the turret. At this point, Person A should grab the turret and turn it sideways, such that Person B is in between the turret and the floor. At this point, Person B should enter Edit Mode; they will find themselves beneath the glass.
Respawn points can be placed in the room.
Teleporter/Host Method[]
This method requires two players to cooperate (local or via Xbox Live); the two players will need to figure out which one of them is the "host."[1]
First, the two players must overload the map. Then, the glitch may be attempted.
The player that is not host should spawn a Receiver Node and place it on the glass floor. They should then button-mash A until the Teleporter sinks beneath the floor. Once that is done, the player can spawn a Sender Node and use that to get in. This method works in other parts of Snowbound, including the Ghost/Mongoose spawn point.
References[]