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Fifty years ago the last atomic bomb test shook the Pacific's Bikini Atoll. Now corals are flourishing here again—though with 42 fewer species than prior to the bomb blasts. At least 28 of the missing corals appear to be genuine local extinctions, victims of the 23 bombs exploded at Bikini between 1946 and 1958. An international team has been surveying biodiversity at the atoll, including diving into the 1954 Bravo Crater, site of the most powerful American atomic bomb ever exploded (15 megatons, 1,000 times bigger than Hiroshima). The Bravo bomb vaporized three islands, raised water temperatures to 100,00 degrees F, shook islands 125 miles away and left a crater 1.25 miles wide and 240 feet deep.