They were rolling in the deep. Scientists have identified what could potentially be the “deepest known blue hole” in the world, extending so far down that the bottom has not yet been reached.

Plunge into this deep blue hole and you'll discover imposing ancient stalactites (calcium deposits resembling icicles) and coral fringe. Declared a UNESCO World Heritage Site in 1996 – along ...

Dean's Blue Hole is the second deepest sinkhole in the world and the deepest one filled with salt water. A habitat for a variety of fish, the sinkhole can be traversed by even novice swimmers and ...