When we hear all the bad news about how climate change, pollution and overfishing are destroying marine habitats, it's not hard to get thoroughly depressed. Is there hope amidst the gloom and doom? This is the story of the innovators and image-makers, the adventurers and organizers who don't always make headlines but are doing their part to protect the oceans. These intrepid conservationists are pulling off amazing feats, despite the odds, the gloom, and the daunting, sometimes thankless task of swimming against the tide.