Inside a French Polynesian coral garden with over 21,000 corals

In the turquoise waters of Mo'orea, French Polynesia, Coral Gardeners are growing thousands of corals in underwater nurseries before planting them back onto damaged reefs, as part of the Rolex Perpetual Planet Initiative. CNN's Bijan Hosseini dives in to see how it works. #calltoearth #perpetualplanetinitiative