Rather, the crater still showed distinct "ripples" - structures that radiated from the center of the bomb blast, "like if somebody dropped a very large pebble onto the sea bed," Trembanis said. Contrary to the scientists' expectations, time hadn't smoothed the crater's rough interior.
Seen at that resolution, the Baker crater was astonishing in its depth and breadth. When he and his colleagues visited the site, they mapped an area about 1.5 times the size of Central Park in New York City, creating digital models at a resolution of 1 meter per pixel and representing more than 20 million data sounding points. “We needed advanced sonar to be able to see this large feature," Trembanis said. Though the National Parks Service surveyed Bikini during the late 1980s and early 1990s, the crater from the Baker blast wasn't visible, Trembanis said. "Within seconds more than 2 million tons of water, sand and pulverized coral shot in the air, in a column more than 900 feet wide and 1 mile high." "The bomb went off in a microsecond," Trembanis said. One of these tests, known as "Baker," was the first to detonate an atomic bomb underwater, on July 5, 1946. A 3D-printed model shows one of the submarines placed in Bikini Atoll waters to test the power of a nuclear bomb.
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