 Submarines offered security and their stealth allowed for a fair chance of success.Between 1942 and 1944, approximately 35 submarines attempted the journey from Europe to the Far East, and at least 11 attempted the journey from the Far East to Europe.On its journey from Germany to Malaysia, "RO-501" carried precious metals, uncut optical glass, models and blueprints necessary to construct a Type IX U-boat in addition to motors and blueprints for the Messerschmitt Me 163 "Komet” rocket fighter airplane.