Gas canister

These devices of Forerunner build, were most noticeably seen at the Gas Mine. They were presumably used by the Forerunner for the containment and disttribution of gas, whether to harness it as a source of power, or to make practical use of it, and store it for later purposes.

Appearance
Gas Canisters come in two variations, empty, or filled. The empty variant is a clear box, with no special features to speak of. The latter is filled with gas from the gas giant Threshold and possess a swirling blue appearance to it. When a filled canister experiences a breach, the gas violently escapes from it, producing a potent explosion as it disperses in the air.



Gas canisters are quite potent with a filled one possessing power roiughly equivalent to that of a Plasma Grenade

Ironically, empty ones prove to be exemplary cover, albeit the fact that the bulk of them move on conveyor belts. As the player approaches the hangar bay docked with a Seraph. one may see that a lone sentinel is carrying a canister. This may be accomplished with built in clamps, or magnets. Overall ingame, the Gas Canisters appear in two campaign levels, The Arbiter, the Oracle, and in addition to that, empty ones can be found in the Halo 2 muliplayer map Colossus.