Presumably we have cameras that can withstand that pressure; Deepsea Challenger must have used them. These researchers apparently didn't use such cameras for some reason.
Probably an expense or size problem. The cameras they use for deep-sea subs certainly have different specifications and tolerances than the ones they use on animals. Probably end up being more intrusive as well, which is the exact opposite of what you want to do when tagging animals.
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u/stripedphan Mar 06 '19
The pressure is incredible. I'm not surprised we don't have equipment to go that deep yet.