Think of all the challenges of exploring a cave. Going in a long, dark, winding maze of tunnels with no light except what you bring with you. The possibility of taking a wrong turn, or your map being incorrect, or some other circumstance that forces you into uncharted territory. The risk of getting stuck and being utterly helpless. The inability to communicate with anyone outside, meaning that your only hope for rescue is them realizing something’s gone wrong soon enough.
Now combine that with all the risks of deep-sea diving.
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