A whiz-bang collection of true diving stories about Tom Shelnick, Above and Below occasionally reveals evidences of fiction as well. These stories really move, are sometimes touched with poetry and have quite a bit of hard-bitten Hemingway humor. Tension and danger are constant, relieved only by a passing rainsoaked native girl or bikinied redhead. (""What color are your eyes?"" I asked. ""They keep changing.""--""Pop-bottle green,"" she said.) The stories concern diving for lost bodies, for treasure, for TV footage on sharks, for laying pipes, for two men trapped in a sunken barge, and even for two miners trapped in a silver mine. The first story ""The Missing Man"" is very ugly and queasy readers should skip it; in a way it gives a bad impression of the terror and humor that make up the bulk of the book. Shelnick is such a genuine character that for once the sharks don't steal the show.