The Great Blue Hole off the coast of Belize is a giant marine sinkhole over 1,000 feet across and 400 feet deep.

Some deep-sea octopuses brood their eggs for years.

The ocean contains structures larger than mountain ranges.

A group of jellyfish is called a smack, a bloom, or a swarm.

The vampire squid feeds primarily on marine snow.

The Marianas Trench is located in the western Pacific Ocean and is about 11 km at its deepest point.

Coral spawning events, triggered by moon phase and water temperature, release billions of eggs in a single night.

Some deep‑sea fish create their own light.

The Mariana Trench is so deep that Mount Everest could be placed inside it and still be covered by over a mile of water.