The sea, like the land, is filled with diverse environments, and as a result, the ecosystems within these waters vary drastically from place to place.

Just as cod are caught in the North Sea but not off the coast of Hawaii, and tropical fish from Philippine coral reefs are absent in the East Sea, this rule doesn’t apply when it comes to the “abyssal creatures.”

These creatures can be found anywhere on Earth, at any depth, unless you are talking about specialized environments like "Objects" or "Hives."

To give an analogy, think of the monsters that come out of gates. …