Many deep-sea creatures cope by creating light themselves - also known as bioluminescence.

No sunlight is able to reach this deep.

The Japanese Spider Crab is the largest known crab with a maximum leg span of 3.8m.

Coelacanths were thought to be extinct until found alive in 1938.

Black Swallowers can swallow entire fish whole — even those vastly larger than themselves!

Goblin Sharks are known as "living fossils" because they're the only living species of a lineage that has existed for 125 million years.

Vampire Squids eat marine snow - organic material that falls from shallower waters.

The Orange Roughy can live up to 200 years. Deep sea life often have elongated life spans.

Many deep sea species use the color red as camouflage since it's the first color to leave the spectrum as you dive deeper.

Meals are rare in Explorer. Deep sea creatures have adapted to this — one Giant Isopod in captivity went five years without eating.

Hydrothermal vents are formed from seawater passing through extremely hot volcanic rocks. They release heavy metals that are toxic to most animals.

But even in those extreme conditions specialized life finds a way to survive.

On April 14th, 1912, the Titanic sank to its final resting place at a depth of 3,800 meters.

The temperature here is near freezing and very few animals can survive the extreme pressure.

More people have been to the Moon than the Hadal Zone.

Most of the Hadal Zone takes place in deep sea trenches.

Deep sea trenches form by a process called "subduction" where the Earth's tectonic plates meet and push together.

So little is known about life in these deep environments. Almost every expedition uncovers something new.

On January 23rd, 1960, Jacques Piccard and Don Walsh descended into the Mariana Trench aboard the submarine Trieste.

Their goal was to reach The Challenger Deep — the deepest point in the ocean.

After 4 hours and 47 minutes of anxiety and claustrophobia...

They succeeded and became the first humans to reach the deepest point in the ocean.