More people have been on the moon than have visited the region of ocean depth known as the "twilight zone." And maybe that's understandable: a dive down there requires specialized equipment, including bulky, redundant sets of gear in case anything goes wrong. But trips to the twilight zone are inevitably rewarding, with new species always swimming into view.
Why Is It So Unexplored?
The Thrill Of Exploration
Watch And Learn: Our Favorite Videos About Ocean Exploration
Pressure in the Twilight Zone
Get a glimpse of the animals that exist at this depth.
Key Facts In This Video
The Twilight Zone is located below normal scuba diving range, but above the range of submersibles. 00:05
Divers in the ocean's Twilight Zone experience pressure about 10 times greater than surface pressure. 01:35
Divers that descend to the Twilight Zone only have 15–20 minutes to perform their work before beginning an ascension that takes multiple hours. 02:44
15 Scary Deep Sea Creatures
Deep-sea creatures look nothing like those we know on land.
Why Do Deep Sea Creatures Look So Scary?
Learn about what happens to life when sunlight is scarce.
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