I think there was a wildlife programme on this once as I seem to remember single manned submarines going a mile deep into the water and talking about the animals but I don’t know how they do it. I would talk to the experts which I am not one of, although I find it fascinating and amazing to think we have animals deep under the sea.
I have found a great website and a Facebook page of marine biologists, on the webpage they have lots of information on what they do and find and how they do it, they also have a question section.
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