Instead of drive-ins. . . dive-ins and one seaweed special coming up. This book should hook the many enthusiasts who are turning to the world of ""Inner Space."" Starting with a brief history--did you know that Aristotle described an underwater demolition team?--and taking you up to the age of Jacques-Yves Cousteau, this describes the latest in equipment and techniques. There's the new SAS, ""surface air supply,"" units along with the established aqualung; snorkling set-ups from instruction to maintenance with specific and reasonable recommendations; lists of manufacturers and training centers. And there's a second-thought provoking run-down of possible dangers; a fairly comprehensive discussion of the physics involved; a chapter on hunting and underwater photography and a tantalizing glimpse of gold and wreck diving. . . want to pay a visit to the Andrea Doria? . . . Especially for the novice who can hardly wait to let it sink in.