Monsters From The Abyss

It's commonly said we know more about the surface of the moon than we know about what happens right here on our own planet, in that murky world at the bottom of the sea. And indeed, we have only explored less than 5 percent of our oceans.

We humans would last only a fraction of a second at the bottom of the sea before being totally, completely pulped by the crushing pressures.
But even in the deepest part of the ocean, in the absolute, total, complete darkness, there is life.