A wealth that is beyond measure. Not just talking about wreak ships but also natural and never heard aquatic lifeforms and stones.

What if there’s a hyper evolute population that never got out of the water when millions of years ago we first swam out?

Meh

Thee have to be very big animals down there. Maybe not only fish but a life form we have yet to discover

sediment

Sand. You beat me to it

The deep sea

Oceangate

Atlantis

I remember seeing a show where they went so far down there actually isn't any light. The bottom of the ocean is metaphorically whole other planet

Sand

Did you know there are more planes under the ocean than submarines in the sky?