Nuclear Plant Outside A (The front entrance)
Nuclear Plant 1 (The main entrance of the level, largely unchanged from E1M2)
Nuclear Plant 2 East/West (Both are identical staircases leading to Nuclear Plant 2 Main, largely unchanged from E1M2)
Nuclear Plant 2 Main (Where the Red Keycard was)
Nuclear Plant Outside B (The place where you fought the Labguy, separated from Outside A by a fence)
Nuclear Plant X (This is where you would find the Backpack in a normal Doom game)
Nuclear Plant 3 (This is just a side room)
Nuclear Plant 4 (The first room after the Red Securomatic Door)
Nuclear Plant 6 (The room with the barrels, also known as Override Room A)
Nuclear Plant 5 (The room with the computers)
Nuclear Plant 8 (Steam Outflow Override, also known as Override Room B)
Nuclear Plant 7 (Water Flow Control, also Current Location)
And for future reference, if you guys start chaining actions again I will invoke Finagle's Law and things will go wrong, whether it's a door that closes at an inconvenient time, shooting something that's already dead while in the middle of combat, or walking into a fence (just to give some examples that we've seen already)