I understand bottom of oceans have huge pressure differentials and lack of light.
However I don’t see why we can’t use two fiber optic cables (one for light one for camera) to explore the bottom of the ocean. When I say fiber optics for camera I mean the slender cameras they use during surgeries.
I’m sure these strands of plastic/glass can handle way more pressure than human body or metal submersibles.
In: Engineering
We can and do use unmanned subs tethered to a support vessel to explore the ocean floor. The problem isn’t getting something down there to have a look around, the reason we haven’t explored most of the ocean floor is that there’s just so much of it to explore and not enough reward to justify spending the kind of time, effort and money that would be required to explore it so we tend to focus our efforts on specific points of interest rather than general looking around.
It’s also worth noting that a simple visual look probably isn’t the most useful method for exploring anyway as you can’t see very far and even a thin layer of sediment would hide a lot so we tend to use sonar to scan larger areas more quickly
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