The Great Blue Hole — the world’s largest blue hole — is a massive underwater sinkhole off of the coast of Belize. It lies near the center of Lighthouse Reef, a small atoll 60 miles (96 kilometers) east of the Belize mainland. The hole is near perfectly circular in shape, more than 1,000 feet (305 meters) across and 480 feet (146 meters) deep.
The Blue Hole is the result of repeated collapses of a limestone cave system formed during lower sea level stands in the course of the last ice age.
The outer edge is merely a few feet underwater at high tide. It’s 480 feet (146 meters) deep instead of the shallower 390 foot depth because the atoll is on a geological fault block that’s been subsiding into the basin through geologic time. It’s not an easy place to reach.
This incredible geographical phenomenon is one of the most astounding dive sites in the world, made famous by Jacques-Yves Cousteau who declared it one of the Top 4 scuba diving sites on Earth. In 1971, he brought his ship, the Calypso and his 1-man submarines to the hole to chart its depths and examine stalactites suspended from overhanging walls.
This incredible geographical phenomenon is one of the most astounding dive sites in the world, made famous by Jacques-Yves Cousteau who declared it one of the Top 4 scuba diving sites on Earth. In 1971, he brought his ship, the Calypso and his 1-man submarines to the hole to chart its depths and examine stalactites suspended from overhanging walls.
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