British U-class submarine
1940 CLASS OF BRITISH SUBMARINES
U class submarine; British u class submarine; U class submarine (British); U-class submarine (British); British U class submarine; U-class submarine; Springeren-class submarine
The British U-class submarines (officially "War Emergency 1940 and 1941 programmes, short hull") were a class of 49 small submarines built just before and during the Second World War. The class is sometimes known as the Undine class, after the first submarine built.