Ocean explorers Howard and Michele Hall turn their love for the ocean and their concern for the future of the world's coral reefs into action. With Jean-Michel Cousteau, deep reef scientist Richard Pyle and Fijian diver Rusi Vulakoro, the Halls explore and capture on film the dazzling underwater world of coral reefs, magical places here on Earth. But this undersea exploration warns its viewers that the natural magnificence of the world's most impressive coral reefs is, in most cases, a mere 30 years away from extinction due to the devastating effects of global (and oceanic) warming. Whether or not that timeframe is accurate (and there's not enough solid science presented here to prove it either way), it's tragically obvious that we are in the process of losing entire ecosystems that cannot be replaced, and when you witness these awesome coral reefs in their still-thriving vitality, you experience a sense of urgent responsibility toward our stewardship of the Earth.