Thousands of meters beneath the surface of Hawaii's warm, sunlit waters lies the vast Hawaiian Ridge, a dark, cold region more than 2,600 kilometers in length. Its undersea mountains, sediment plains, lava flows, and volcanic vent fields are home to a variety of unusual deep-sea organisms.

Since 1965, the ridge's unique geological features and animal communities have been studied with the aid of submersibles. This copiously illustrated volume describes 200 animals and geological formations photographed and collected by the University of Hawaii's HURL (Hawaii Undersea Research...