The Great Blue Hole is an underwater sinkhole off the coast of Belize. It measures around 300m in diameter and 125m in depth. It is one of the most famous spots of the world for scuba diving. The popularity of the place can be judged by the fact that it has been ranked among the most amazing places on the earth.
The circular submarine hole was given worldwide attention in 1971 by Jacques-Yves Cousteau, a pioneer in marine conservation, who travelled there to research its depth. The hole was actually formed above water, and was then flooded as sea level began to rise, fact that was confirmed by the discovery of stalactites in the submerged caves.
A symbol of Belizean tourism, this spot also has diverse marine fauna, such as nurse sharks, giant groupers, and several types of reef sharks. The tourism has flourished in the country due to this place, which includes full day activities of scuba diving by local tour operators, often departing from Long Caye island, located within the same atoll as the Great Blue Hole, Lighthouse Reef.