CNN 's Going Green : Oceans will take you above and below the water for a unique perspective on how coral reefs impact the world 's oceans and you . Join CNN Special Correspondent Philippe Cousteau as he explores Australia 's Great Barrier Reef with scientists from the Catlin Seaview Survey as they map the extraordinary eco-system with pioneering photographic equipment . Watch the 30-minute Going Green : Oceans special on Friday March 29 at 15:30 GMT ( 11:30 ET ) . Join Cousteau online immediately after the show at 16:00 GMT for a live one-hour Twitter chat about ocean health and how you can help promote and preserve biodiversity beneath the waves . Send your questions to Philippe using # CousteauCNN .
Environmental advocate Join Cousteau hosting a Going Green : Oceans special . GMT joins team from Catlin Seaview Survey as they map Australia 's GMT . Watch Friday March 29 at 15:30 GMT ( 11:30 ET ) Philippe Cousteau for Twitter chat immediately after show # CousteauCNN .