Maintenance

Maintenance areas are numerous in UNSC vessels. In case of on-ship attacks, the corridors can be used to flank enemies.

John-117 used several Maintenance corridors on board the Halcyon-class Cruiser to stop the Covenant gaining control of the vessel, along with evacuating to the Lifeboats.

Maintenance access ways are marched with a green triangle on Halcyon-Class vessels, and the Maintenance crew are likely in green uniform as well.