Well, it's the room that usually has a closed door. When you get past the main gate turn left. Down that alley you'll find the big door with a Jawa or two in front of it. Usually it's closed but occasionally it is open. I don't know what you have to trigger for the door to be open. If it is open then it tends to close the moment you start to approach it, but once again, sometimes it doesn't. Either way, that is the room I was talking about.
"God himself could not sink this ship."
What does it do? It sinks.