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I'll add one tiny point to your very well documented answer: another skill you learn for cave diving is to control your kick to avoid raising stilt.

This is particularly relevant since the stilt obscuring the cave is precisely what led to the incident described in this article. It's not clear it happened because the divers were careless or despite them, but I thought it would be worth pointing out to non divers that one of the many things you learn while studying for cave diving is how to occupy a lot less space while swimming than you're used to.




The article says that the stilt raised as they found each other abruptly, losing the guide as well.




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