Hades is the classical Greek word for the underworld (Hell). Deep ocean trenches

make up the World Ocean's "hadal" zone. ... With depths greater than 20,000 feet, this area of the world is larger than the U.S. but largely unexplored.

Can you go deep in the ocean?

The deepest point ever reached by man is 35,858 feet below the surface of the ocean, which happens to be as deep as water gets on earth. To go deeper, you'll have to travel to the bottom of the Challenger Deep, a section of the Mariana Trench under the Pacific Ocean 200 miles southwest of Guam.

Why can't humans go deep in the ocean?

“The intense pressures in the deep ocean make it an extremely difficult environment to explore.” Although you don't notice it, the pressure of the air pushing down on your body at sea level is about 15 pounds per square inch. If you went up into space, above the Earth's atmosphere, the pressure would decrease to zero.