Diving a cave is swimming through a series of complex tunnels, in pitch black (other than whatever light sources you bring) , on a timer (your air tanks).
It’s easy to get lost because it looks different when you’re coming back the other direction. The size of the tunnels can become small, making it easy to get stuck or damage your gear. If you get lost /have an emergency and run out of air, there’s no popping to the surface. You’re toast.
Cave divers sometimes trail a long spool of cord behind them, as a way to find their way back out.
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