Word: 21s
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Dates: during 1940-1949
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...Schnorkel," an extendable air pipe which enables a submarine to recharge the batteries by diesel while submerged (TIME, Feb. 19). In one 45-day patrol, Model 21 U-boat spent all but four days under water. Only drawback: cooped-up living conditions. Some 116 of the formidable Model 21s were built, but minor defects kept them from going to sea on real war patrols...