Down to a sunless sea

Depth: 105...Wriggling like an eel, he forced himself up into the narrow gap he'd created...Rocks scraped and clattered away. A hint of doubt-- Should I be doing this?-- was answered by the calm comfort that pervaded his mind now. Nothing was going to happen...Everything was going to be all right... Welcome to the most dangerous sport on Earth: where cave divers step into murky Florida ponds and end up hundreds of feet beneath the ground, slinking through Swiss-cheese-like rock formations, past strange underground creatures, heading down tunnels that may open into caverns, or lead nowhere at all. Open-water diver and ex-Navy SEAL 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 who is opening up her heart, and a 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 heartstopping storytelling power of John D. MacDonald, David Poyer stakes his claim as one of America's most remarkable thriller writers-- and a master of underwater suspense.