Allan Rockwell McCann was in charge of the development of a submarine rescue chamber, which bears his name, "The McCann Submarine Rescue Chamber". Additionally he was assigned as Liaison Officer / Engineer when the submarine was converted for use in the under ice attempt to circumnavigate the Arctic Ice cap and voyage to the North Pole. Modifications to the submarine were extensive, and contained innovations of a telescoping conning tower, an ice drill, an incorporated diving bell and an Air Lock, designed by Simon Lake. The submarine was designated "Nautilus" and leased for one dollar to Lake and Danenhower, Inc., of Bridgeport, Connecticut,
French submarine Espadon (S637) front of her sail. On 13 August 1963 a fire in the torpedo room wounded and intoxicated four sailors, one of whom later died of his wounds. In May 1964, "Espadon" and "Marsouin" steamed under sea ice in the Norwegian Sea as far as 70° north. "Espadon" undertook significant modifications from 1966 to 1968, notably upgrading the boat's sonar, sail and rudders. "Espadon" has been a museum ship at the "ville-port" of Saint-Nazaire in the German-built submarine base since 1987. French submarine Espadon (S637) Espadon was a "Narval"-class submarine of the French Navy. Along with sister boat "Marsouin", the boat