About this site
The Great Blue Hole is a 300 m wide, 125 m deep submarine sinkhole at the centre of Lighthouse Reef Atoll, declared a UNESCO World Heritage Site and made famous by Jacques Cousteau. Divers descend through the hole's cobalt-blue water to 40 m to see perfectly preserved stalactites formed when the cavern was above sea level during the last ice age. Bull sharks, Caribbean reef sharks, and midnight parrotfish cruise the outer walls.
Depth range10–40m
Best months to dive
NovDecJanFebMarAprMay
Known hazards
⚠ depth⚠ limited-viz
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17.3160, -87.5350
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