Made famous by an early Jacques Cousteau Calypso expedition, Belize's Blue Hole is located in a remote region of the Barrier Reef 60 miles offshore. A unique geological formation created when the roof of a limestone cave system fell in, Belize’s Blue Hole is almost perfectly round, 1000 feet across, and more than 400 feet deep. A typical scuba dive in the Blue Hole goes to a depth of 130 feet, where a gallery of stalactites creates an otherworldly tableau. Bottom is necessarily short, but the experience is one every serious diver would like to have under their weight belt.