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We’ve mapped less than 10 percent of the ocean with the resolution we’ve mapped 100 percent of the Moon and Mars, and yet when we send rovers to Mars what’s the first sign of life they probe for? Water. David Gallo’s ‘Underwater Astonishments’ reminds us of how little we know about our own blue marble planet and the 97 percent of its livable habitat that is saltwater. Remember that we air-breathing terrestrials only inhabit about 300 feet of space from prairie dog burrows to the tops of the trees where birds nest. Above that is only heaven and space. Hundreds of people have now gone into space, calling it “the last frontier,” but last year Jim Cameron became only the third human being ever to reach the lowest point on our planet, seven miles down in the Pacific’s Challenger Deep.

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David Helvarg is Executive Director of Blue Frontier Campaign (www.bluefront.org) and the author of five books: Blue Frontier, The War Against the Greens, 50 Ways to Save the Ocean, Rescue Warriors and Saved by the Sea. He is editor of the Ocean and Coastal Conservation Guide, organizer of several ‘Blue Vision’ Summits for ocean activists, and winner of Coastal Living Magazine’s 2005 Leadership Award and the 2007 Herman Melville Literary Award. Helvarg worked as a war correspondent in Northern Ireland and Central America, covered a range of issues from military science to the AIDS epidemic, and reported from every continent including Antarctica. An award-winning journalist, he produced more than 40 broadcast documentaries for PBS, The Discovery Channel, and others. His print work has appeared in publications including The New York Times, LA Times, Smithsonian, Popular Science, Sierra, and The Nation. He’s done radio work for Marketplace, AP radio, and Pacifica. He has led workshops for journalists in Poland, Turkey, Tunisia, Slovakia and Washington DC. He is a licensed Private Investigator, body-surfer and scuba diver.