Hannes Keller, a Swiss mathematician and inspired amateur explorer, planned his audacious deep ocean dive for more than a year.In December 1962, he intended to descend deeper than anyone before him: 1,000 feet down, off Santa Catalina Island, near Los Angeles, in a diving bell called the Atlantis.If a man could go, for instance, to 1,000 feet down and do practical work, Mr. Keller wrote in The Sydney Morning Herald, then all the continental shelf zone could be explored, a total of more than 16 million square miles.
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