Hitler's 'secret weapon'. Since these days Munich's Deutsches Museum, the biggest technical Museum of the world, displays a 'new' device; the original long-distance rocket 'V2', developed under the Nazi regime and called by that time the 'secret weapon'. The 14 m long rocket is part of a new museum hall that displays pieces from the air-and space travelling. The 'V2'was for the first time, launched in 1942. During World War II. 7 April 1984