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The article discusses two classic books on diving, "Shallow Water Diving for Pleasure and Profit" (1950) and "Shallow Water Diving and Spearfishing" (1954), written by Hilbert Schenck and Henry Kendall. These books document the transformation of diving from a professional activity to a sport. The authors, Schenck and Kendall, had backgrounds in diving technology and presented the material in a methodical and interesting manner. The books cover various diving technologies, including helmets, wet/dry suits, and spearguns, and provide tips on how to go about diving. The authors' lives and accomplishments are also briefly discussed. [Extracted from the article]

The article describes Fukuryu, a tactic developed by the Japanese government that would allow the Japanese divers to strike the enemies unknowingly as they approach the Japanese beaches. It points out that this concept, which literally mean Crouching Dragon, was first developed at the Naval Construction School at the Yokosuka Naval Base, Japan and was submitted for government approval on March 11, 1945. Fukuryu are described as patriots that are willing to giving up their lives for the country and deserves a place in the history of diving.