What we do know is that the pressure is so intense, no human * could make it even a quarter of the way down without THIS happening to his or her body:
*Unless you’re James Cameron and you can afford to build a pressure-resistant robot to take you to the bottom of the ocean.
the oceans are complex ecosystems that are apparently the origin of all life on earth, including us. they are in us and a part of us. we share about 75% of our DNA with fish and even have gill slits in the womb, for example.