Used to describe something vast and hard to comprehend, not just oceans.

Metaphorical Use

Highlights an extreme degree of depth or complexity in various contexts.

Emphasis on Depth

Can be used figuratively to imply a profound or intense state.

Not Always Literal

Commonly used in the science of oceanography to denote great ocean depths.

Oceanography Term

Refers to habitats with high pressure and low temperature; unsuitable for humans.

Extreme Environments

It's a technical term; use it when discussing marine biology or oceanography.

Specialized Vocabulary

 and those that feed without moving, many of these cumbersome creatures pass their time grazing the seabed. Sea cucumbers are found everywhere from shallow shores to abyssal trenches 6,000 meters below sea level. On the deep sea floor, they comprise the majority of animal biomass,

This sea creature...

 known moving images of the abyssal tusk eel a species of fish that can live deeper in the sea than any other known fish these are Lantern sharks the tiniest sharks in existence they're so

Abyssal