The Blue Hole, a sinkhole in Lighthouse Reef Atoll off Belize, is one of the world’s most iconic dive sites. Its dramatic geology, mysterious history, and thriving marine life combine to create an unforgettable diving experience.
Geological Formation
The Blue Hole is a drowned sinkhole created during the Pleistocene ice age when sea levels were much lower. Freshwater solution caves formed in the limestone bedrock. As ice melted and sea levels rose, the caves flooded, creating the distinctive circular depression visible from the surface.
The hole is approximately 300 metres in diameter and 125 metres deep. The depth and darkness give it the appearance of a bottomless pit—hence “Blue Hole”.
The Dive Experience
Most diving occurs at 30-40 metres around the rim where a submerged stalactite formation creates one of diving’s most distinctive geological features. Large groupers, sharks, and schooling fish inhabit the hole, attracted by the productive water circulation.
Access and Safety
The Blue Hole requires a long boat journey from Belize City (3+ hours each way). Diving is only feasible on calm days. Most divers combine Blue Hole diving with reef diving en route, making it a multi-site expedition.
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