Shift-F2 starts you in the back of the control room, from there you can navigate using the arrow keys and mouse much like you can navigate with the external camera. There are no new compartments, but if you "fly" through the door to the radio room, you go to the radio room, and if you "fly" through the hatch to the conning tower, you go to the conning tower.
The reason people say be careful, is because flying beyond these points, or out through a random wall can cause you to become "stuck" or worse yet, it can cause the game to crash.
Basically, the Shift-F2 free-cam is a novelty that wears off quickly IMO, but it's worth at least once in each boat.
-UB
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