In the waterway facility water treatment plant, on the lower level in the SW corner, the tall ladder that connects up to the pipes: I just got a variation that was shock floors with the entrance being that ladder. By far the worst entrance to this dungeon you can get. I did not have the option to climb up the ladder and jump to the pipes, but when I came to it from the pipes side, I had the option to jump over and climb down or jump over and leave. I think the option to climb the ladder from the bottom and jump to the pipes should be included. I've seen it in other variations.
