Sea Change: A Message of the Oceans

In 1952, at age sixteen, Sylvia Earle—then a budding marine biologist—borrowed a friend’s copper diving helmet, compressor, and pump and slipped below the waters of a Florida river. It was her first underwater dive. Since then, Earle has descended to more than 3,000 feet in a submersible and, despite beginning at a time when few women were taken seriously as marine scientists, has led or participated in expeditions totaling more than 7,000 hours underwater, and counting.

Equal parts memoir,...