The natural companion to Saucer in the Sea (1965), this tells through the text and the numerous, step-by-step, black-and-white photographs, just about everything young aquaphiles are likely to want to know about the Sealab projects (especially SEALAB II, the most recent), the Navy's experiments with teams of men submerged for extended periods of time in steel cylinders. The information was gathered mainly on the spot, and is offered in a documentary styled run-down of how the labs are constructed, the whole process of submerging and operating them, the crew members and their functions, from day to day, the experiments carried out, and so on. It's all here in minute detail, from excellent diagrams to the human interest records. The photographs are completely explicit, although faded looking. There is a postscript about the plans for SEALAB III.