snorkel

"Snorkel" is defined as, "a breathing apparatus used by swimmers and skin divers, consisting of a long tube held in the mouth" (AHD). It is also said to be "a retractable vertical tube in a submarine that contains air-in-take and exhaust pipes permitting extended periods of submergence at periscope depth" (AHD). A more in-depth description is offered by a 1950 edition of the Saturday Evening Post, which states that the snorkel was "invented by the Dutch, stolen by the Nazis and perfected by the U.S. Navy, [...] the snorkel has revolutionized naval warfare" (OED). Funny how a word that so many people identify with an innocent beach-vacation pastime was politically charged at one point. "Snorkel" comes from the German word "schnorchel," which means "nose," or the "resemblance in shape to a nose" (AHD).
-AHD and OED