Dean's Blue Hole is the world's second deepest known salt water blue hole with an entrance below the sea level. It plunges 202 metres (663 ft) in a bay west of Clarence Town on Long Island, Bahamas.\n\nBased on this passage, dean’s blue hole is one of deepest? Okie... think carefully first, then make a decision:
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To answer this question, we should know that: Dean's Blue Hole is the world's second deepest known salt water blue hole with an entrance below the sea level. So, the answer is salt water blue hole with an entrance below the sea level.
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