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RE: Spelunking the Sport of Troglodytes.
They run for kilometers and join up with other cave systems in the area. The lower reaches extend into an underground lake and divers have never explored them all.
They will remain unexplored because a diver was lost in the underground lake system. He did surface with insufficient air to get out of the cavern he was in... his body was found 3 weeks later and he had starved to death unable to dive to return.