The Great Blue Hole, a giant submarine sinkhole roughly 300 meters across and 124 meters deep, was popularized as a world-class dive site by Jacques Cousteau's 1971 expedition.
Record no. MRB-2026-006715
World's Largest Marine Sinkhole
Reference Record – Not Certified
This record is compiled from publicly available sources for reference. It has not been examined or certified by The Book of World Records.