VIDEO: Colossal coral found in the Mariana Islands is largest of its kind Researchers measure 14,500-square-foot coral structure in an underwater volcano A NOAA researcher swims in front of the massive coral found in the Mariana Trench Marine National Monument in May 2025. (Image credit: NOAA Fisheries) Download Image March 17, 2026 Ocean & Coasts Fisheries 0 Off
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