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The Great Blue Hole (in Italian literally "Grande Voragine Blu") is a large marine sinkhole located east of the coast of Belize, in the Caribbean Sea. Jacques-Yves Cousteau, the one who made the first explorations in this site, elected the Great Blue Hole as one of the ten most interesting dive sites in the world, after having gone there in 1971 with his ship Calypso to monitor its depth.