In 1969 we even walked on the moon. And yet as late as 2000, the earth’s deepest cave—the supercave—remained undiscovered. This is the story of the men and women who risked everything to find it, earning their place in history beside the likes of Peary, Amundsen, Hillary, and Armstrong. In 2004, two great scientist-explorers are attempting to find the bottom of the world. Bold, heroic American Bill Stone is committed to the vast Cheve Cave, located in southern Mexico and deadly even by supercave standards. On the other side of the globe, legendary Ukrainian explorer Alexander Klimchouk—Stone’s polar opposite in temperament and style, but every bit his equal in scientific expertise, physical bravery, and sheer determination—has targeted Krubera, a freezing nightmare of a supercave in the Republic of Georgia, where underground dangers are compounded by the horrors of separatist war in this former Soviet republic.

    The vehicle in question was an amphibious jeep developed by the U.S. Army, which Carlin christened Half-Safe, after a deodorant slogan. It was a mechanical mongrel that was supposed to move with equal ease across land and water but in practice wasn't much good for either one. Undaunted, Carlin and his wife Elinore set off across the Atlantic Ocean with dreams of fame and fortune, and of carving a small notch in history. What happened next is one of the most bizarre, remarkable, and forgotten adventure stories of the 20th century. In Half-Safe, author James Nestor endeavors to uncover Ben Carlin's fate and finds a gripping story of love, danger, and extraordinary perseverance that spans three oceans and five continents. Half-Safe takes us from the eye of an Atlantic Ocean hurricane to the sweltering Sahara to the impenetrable jungles of Southeast Asia—and into the mind of a man who could overcome everything but his own demons.