Sharks, fish, sea cucumbers and basicly everything in the ocean!
You would blow up from water pressure.
No! Because the currents under the water, down that deep, does not arrouse the sand and the water is not then moved
the answer to the question in which you just asked is... presently something that is not within my realm of knowledge
Dolphins can go 23 miles deep in water.
Yes the water table is the level of water under ground .... it is currently very deep under water.
Clams live under the sand by the water most of the time. They live in waist deep water because they have to have water to live and if something in the water moves them they will stay under the water.
Trenches
The deepest submarine is built to go 10000 meters under water. This is so they can go to the bottom of the ocean floor.
Of course when you swim under the surface of the water. The lower you go in the water, the greater the pressure. That's why divers have gauges with them to determine their depth or to know how deep they are in the ocean.
Deep
Yes they have ben spoted that deep under water.
mountains under deep water. I guess.