The Methane Pipeline is an object in Metroid Prime Hunters, found in the Fuel Stack room on the Vesper Defense Outpost. It is mounted on the ceiling of a corridor in the room and delivers a blue liquid methane through the room, powering the technical systems within it. It should be noted that methane is blue in real life, at least when ignited, such as on a gas-powered stove. This methane can likely be ignited as well.
Metroid Prime Hunters
Liquid methane fuel delivery system.