nsfw:racy: Very Likely | adult: Possible ocr: 242 THE NATIONAL GEOGRAPHIC MAGAZINE THE OBSERVER ABOVE KEEPS CAREEUL WATCH THROUGH THE WATER GLASS When a diver is down, no matter how experieniced he may be of how esy the dive, the prsn at the hose on deck never relaxes vigilunee. Thatngraphs frat Dr. William Deebe FIVE FATHOMS DOwN, THE DIVER EXPLORES A NEW WORLD Equipped with helmet and hose, a human being can climh, walk, crcop anid leap almost as casily unider the surface as in the air.