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The bottom of this place had stared to fill with water. He thought about grabbing the flashlight, but figured there were probably a bunch of C.H.U.D.s Cannibalistic Humanoid Underground Dweller, the scary creatures from the 1984 horror film of the same name waiting to grab him under there.

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Some of the stuff was in bad shape.

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Connected to the outside by flexible ducts.

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The underside had a bunch of old air handling equipment.

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Behind the shack was a diesel tank.

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This seems to be the whole reason this thing was built. Some kind of old communications equipment.

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On the surface This is what they found when they opened up the shack. A ladder?

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Because the whole thing is suspended from big shock isolators.

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They had to cross a little bridge to get on to the main platform.

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That opened up pretty easily. Inside they could see a metal shack of some kind.

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At the bottom they found one hell of a door.

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That lead to a staircase.

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First stop When they got down the ladder they were standing on a small platform