A scientific expedition to theGreat Blue Hole, a massive marine sinkhole off the coast of Belize, has uncovered compelling ...

It's called the Great Blue Hole. Scuba divers and snorkelers have been cruising the surface waters for decades, but few have dared to venture deeper and explore what lies beyond the blackness.

Tropical storms have been steadily increasing in frequency over the past 5,700 years, new evidence from sediment in the Great Blue Hole reveals, with a massive spike in the past two decades.

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 ...