The deep sea, outer space, and sure, Movile Cave – where nothing went in and nothing went out for over 5 million years. The cave is situated a few miles from the Black Sea coast in Romania ...

“The deep sea, outer space, and caves: Those are the only frontiers left,” says Coons, who does his exploring in a lightweight helmet with a small flashlight duct-taped to the brim.

At the current rate of sea-level rise (possibly several ... Dean’s Blue Hole—Earth’s deepest known underwater cave—plunges more than 600 feet into darkness. The entry to South Passage ...

From the flamboyant blossoms and birds of rainforests to the living rainbows of coral reefs, Earth’s surface is teeming with ...

The glow can come from worms, in dark caves, such as in Dismals Canyon in ... from the ocean surface to the deep sea floor. Today, the glimmering power of bioluminescence has been harnessed ...

The caves once existed above the water line, but were flooded when sea levels rose. Deep within these underwater caves are formations which can only be formed in dry caves - spectacular sculptural ...