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Duke Nukem 3D Hints
Where is the exit?
1 of 5: First, get out of the prison!
2 of 5: Once you've done that, look for the one escape route.
3 of 5: Or, more appropriately, look for the escape vehicle.
4 of 5: The closest thing there is the submarine -- which happens to be named after the sub from The Hunt for Red October.
5 of 5: Swim under it, and you'll find the exit switch there.