Belgian aquanaut Stenuit's account of experimental undersea stations must inevitably be compared with Jacques Cousteau's magnificent World Without Sun (p.1017). Content aside, Cousteau is a mandarin prose stylist of iridescent sensitivity, and one savors his technicolor scarves of description. Stenuit writes as a tub-thumping Columbus of the seafloor, a deep-sea visionary of practical applications--such as protected fish crops, food farms and mines. Stenuit, assisted by Jon Lindbergh (son of Charles), made a two-man descent off the Grand Bahama Bank to demonstrate the feasibility of permanent underwater stations which would allow an eight-hour working day. Meanwhile, submerged at 436 feet for two days in a kind of inflated tent, they established a world's record for endurance at that depth. Stenuit is not impressed with his record breaking depth endurance trial though. It proves only that better equipment and sophisticated techniques are necessary for the practical exploitation of the under-sea devices that match the space equipment the government is sending to the moon. He's convincing.