The engine room is mostly circular with one inaccessible door, forcing the player to explore the area in a clockwise fashion. The area inaccessible via the main room is linear, with straight hallways and corridors. Scattered throughout are aliens, support drones, and guardian drones. There are also a few opportunities for the player to sabotage turrets.
If you take Somah into the engine room, she will make comments about smelling flammable gas and wonder aloud 'what a well placed grenade would do to that thing.' There are several places where the flammable gas can be ignited.