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What giant marine sinkhole off the coast of Belize was made famous by oceanographer Jacques Cousteau in 1971?

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Correct answer: The Great Blue Hole

This massive underwater sinkhole is over 300 meters wide and 124 meters deep, forming part of the Belize Barrier Reef Reserve System. Jacques Cousteau explored it in 1971 and declared it one of the top scuba diving sites on Earth. Divers flock here to see giant stalactites and stalagmites that formed thousands of years ago when the cave was still above sea level, before rising oceans submerged it. Photo: U.S. Geological Survey (USGS), Wikimedia Commons, Public domain.

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Source: Wikipedia (CC BY-SA)

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