This is going to blow your mind. The ocean is mindbogglingly deep. It’s way deeper than Mount Everest is tall — it’s seven miles to the bottom of the deepest part of the ocean (Challenger Deep in the Mariana Trench).
We have only explored about five percent of the ocean. We really have no idea what’s down there or what sort of huge, terrifying creatures may live in its pitch black depths. It’s really incredible just how much of the earth remains unexplored, and most of it is underwater.
We really live on two planets in one. The terrestrial planet, where we are, lies above, and the oceanic planet, with its atmosphere of water, has its own mountains, valleys, deserts, and even its own lakes and rivers (brine pools).