Imagine swimming in crystal-clear waters, surrounded by dramatic rock formations, and discovering secret passages that ... of ...

Beneath the United States lies a surprising network of caves shaped over millions of years. Some feel almost otherworldly, ...

From a protected cove on Long Island, Dean’s Blue Hole—Earth’s deepest known underwater cave—plunges more than 600 feet into darkness. The entry to South Passage is decorated by ...

Leaning over the mouth of the well, underwater archaeologist Guillermo ... They had walked a long way through the forest to a secret cave and scrabbled down to its center on a scary rope system ...

A group of divers have connected two underwater caverns in eastern Mexico to reveal what is believed to be the biggest flooded cave on the planet, a discovery that could help shed new light on the ...

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 ...