It showed a triangular-shaped mass, impossibly black, surrounded by blue, lapping water. As imagined in a place like Reddit, folks went wild with speculation. Was it a hole in the ocean?

Offshore flooded caves, so-called ocean blue holes, are extensions of the sea, subject to the same heavy tides and host to many of the same species found in the surrounding waters. Inland blue ...

A 30-meter sediment core from Belize's Great Blue Hole reveals 5,700 years of hurricane history, showing a sharp rise in ...

They often appear as a dark blue colour due to its depth, creating a distinct visual contrast against the surrounding water ...

A storm, even once it has passed, can leave traces in the ocean that last for thousands of years. These consist of sediment layers composed of coarse particles, which are different from the finer ...

Beneath the land surface of the Bahamas, the underwater caves known as blue holes stretch for hundreds of miles in all directions. Today, these labyrinthine passages host a variety of tiny sea ...

The Great Blue Hole is located about 60 miles off the coast ... From the comfort of a six-seater plane, you'll gaze upon the Lighthouse Reef, an ocean freight wreck and Turneffe Atoll.

The Black Hole found on the island of South Andros is a large isolated column, about 47m deep and formed by chemical erosion. Its depths replicate ocean conditions billions of years ago.