The official manual and reference to Doom, this guide is filled with little-known facts, insider information, winning strategies, detailed maps, and a wealth of other information to greatly enhance one's enjoyment of the game and appreciation of the massive Doom universe.
The final trigger in this level , t17 , is found across the narrow walkway leading back to the small area east of the blue ... each of which requires one skeleton key to let you pass through 1 SPAWNING VATS Roughly rectangular in shape ...
The Art of Doom