Basically SCUBA diving in the restricted enviroment of a cave.
It is probally the most dangerous form of diving because if you loose the line you drag with you or run out of air.....your screwed.

A hideously dangerous, fun thing to do. Also a hobby of people who are SCUBA-certified, adrenaline junkies, and the explorer types. Cave divers carry three light sources and might have two lines instead of one that they unwind behind them. They have to be careful because excess fin movemant can stir up sediment to the point that it blinds the divers, which is a very bad thing.

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