From the air, the Blue Hole, a breathtaking vertical chute that drops several hundred feet through the reef, looks like a dark blue eye in the center of the shallow lagoon. The Blue Hole was first dived by Jacques Cousteau in 1970 and has since become a diver's pilgrimage site. Just over 1,000 feet wide at the surface and dropping almost vertically to a depth of 412 feet, the Blue Hole is like swimming down a mineshaft. This excitement is reflected in the thousands of stickers reading, "I Dived the Blue Hole."