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Don’t scuba? Here are 10 other underwater thrills

Nearly three-quarters of Earth’s surface is covered by water. What lies beneath is a fascinating and mysterious world of submerged canyons, brilliant corals, and dazzling marine life. Entering the home of whales, jellyfish, and other sea creatures usually means scuba diving—requiring in-depth, open-water training and certification for using complex equipment. But new diving technology, submarines,…