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Mass-migrating corals to save them from a killer heat wave.

The Verge science reporter Justine Calma visited the conservationists who are part of a project moving thousands of the reef-building animals out of the sea to climate-controlled labs on land. High temperatures drive off the photosynthetic algae corals rely on for nutrients, causing coral bleaching that can be deadly.

In this video, you’ll also see a gene bank growing a new generation of baby corals, and the 3D photomosaic maps used to track their replanting efforts in the open ocean.