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Funny... I was looking through this thread while playing the game looking for the last disk in a level not noticing its the level your talking about and I found it (The disc called "The Ark").
You will need a scout vehicle. After the part of the level that has the superheated air (or whatever) you must go straight to the end of the hallway (don't take the door on your right) and use the scout to go through the little hole in the wall and the disc should be right inside the room.