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6. The Lost City of Dvārakā—A 9,000- Time-Old riddle

Mentioned in ancient Hindu textbooks, the lost megacity of Dvārakā was believed to be a myth — until its remains were discovered off India’s seacoast. Said to have been innovated by Lord Krishna himself, this aquatic megacity is estimated to be around 9,000 times old, making it one of the oldest submerged spots ever set up.