To find the engine room, go down the spiral stairs to the dormitory, and go the other way. Ir you are turning right to go to the locker, turn left and through the door to the Engine Room. Laura's advice is good - sve before you finally go down the stairs, so you can re-play after practicing finding and repairing things in the engine room. Once you know the way around you can do it quickly. Then go through the other end of the engine room, into the gears room, and immediately up the ladder to the top level. there is air up there, and you can make a new save, so you can freely practice in that room.
That will be ten Dramoi.