Maxim Gunn and the Stolen Waters

Was there really such a place as Atlantis? And was there a super race ahead of its time, or something so different we wouldn't want to know?
Trapped for thousands of years beneath the ocean until a submarine earthquake frees them, a few survivors emerge on a mission of revenge against the "Dry Landers" whom they blame for the Great Catastrophe.
Kidnappings, blackmail and ugliness keep Gunn fighting to stop them - and the world will never know how close they came to success.