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Author(s):
Robin Cook

Abstract:
A team of researchers in a remote region of the Atlantic become trapped inside an ancient undersea volcano when their submersible is inexplicably drawn in. They discover a technologically advanced world of genetically engineered, physically near-perfect humans living comfortably in an enclosed city within the Mohorovičić discontinuity. The researchers are told that their Moho-dwelling cousins evolved many millions of years prior to current humans and became very technologically advanced. Millions of years ago, these "first generation" humans discovered that Earth was about to be bombarded with hordes of meteors, effectively sterilizing the surface of the planet.