I was thinking the same thing about these divers. I did quite a lot of scuba diving when I was younger. I only ventured short distances into underwater caves and grotto's, and never went deep enough that I couldn't make it back out pretty easily. I was never a cave diver.
I am a bit surprised that the divers are using normal equipment. Maybe they are working in pairs - I guess we would expect them to use the buddy system. It does seem like the underwater passageways of that ship pose some risks.
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