"A powerfully written Florida adventure . . . a compelling glimpse at the mysterious world of cave diving." - The Orlando Sentinel "One of his best novels yet . . . bristles with suspense . . . What makes this novel particularly memorable are the extensive, harrowing descriptions of cave dives, which are riveting enough to terrify experienced divers." -Publishers Weekly "Fans of Clive Cussler will love this thriller." - Library Journal. "White-knuckle diving scenes, constant action." - Kirkus Reviews "Tiller is a character who grows on the reader . . . As usual, Poyer provides a smashing climax, this one fraught with danger from man and nature." - Jacksonville Times-Union "There can be no better writer of modern sea adventure around today." - Clive Cussler "Claustrophobics beware David Poyer's suspenseful cave-diving novel, DOWN TO A SUNLESS SEA, takes readers into water crevices, submerged limestone tunnels, cramped wormholes and subterranean hell holes that give suffocation new meaning . . . Vivid, believable descriptions . . .We can get the fear and adrenaline of cave-diving without ever leaving the dry safety of our favorite comfy chairs." - Tallahassee Sun Democrat Welcome to the most dangerous sport on earth: where cave divers step into murky Florida ponds and end up hundreds of feet below the ground, threading through the narrow passages of Swiss-cheese-like rock formations, heading down tunnels that may open into caverns of breathtaking beauty, or else suddenly collapse in rockfalls that crush out their air and their lives. Open-water diver and ex-con Tiller Galloway has come to this watery underworld to find out why an old friend died young - and take one last shot at being a father, a lover, and a friend. But with a woman opening up her heart, and a deadly conspiracy closing in around him, Galloway must navigate between lies told aboveground and truths hidden in the depths . . . where a violent battle is about to explode. Combining the knife-edged action of Clive Cussler with the heart stopping storytelling skill of John D. MacDonald, USA Today-bestselling Dave Poyer continues to be one of American's most popular and remarkable thriller writers . . . and a master of underwater suspense. "A ripping good read Poyer raises the bar with this one. The cave-diving scenes are riveting, claustrophobic, terrifying, and beautiful." - Booklist