Most of the underwater surveys contributing to these findings, published today, were conducted before and during the recent mass bleaching event, one of the most extensive and serious on record, and have not yet captured how many corals survived or died following the bleaching. Most of the underwater surveys contributing to these findings, published today, were conducted before and during the recent mass bleaching event, one of the most extensive and serious on record, and have not yet captured how many corals survived or died following the bleaching. Ecology Phys.org – latest science and technology news stories