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The roughly circular deep depressions, typically found in shallow carbonate platforms, formed during past ice...........

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The roughly circular deep depressions, typically found in shallow carbonate platforms, formed during past ice ages when the sea level was up to 100–120 m (330–390 ft) lower than at present are a favourite target of extreme divers. What are they called?

posted May 9, 2022 by Saif Khanam

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1 Answer

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Blue holes
The deepest blue hole in the world - 300.89 m (987 ft) deep - is in the South China Sea. It is the Dragon Hole, or Longdong. The second deepest, with underwater entrance at 202 m (663 ft), is Dean's Blue Hole, in a bay of Long Island, Bahamas.

answer May 10, 2022 by Madhavi Latha
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