"Ubådskrig." . . "England." . . "Livet om bord." . . . . "Royal Navy." . . "Ubåd." . . "1. Verdenskrig." . . . "A Precarious Existence : British Submariners in World War I" . . . . . . . . . "A Precarious existence : British submariners in World War One"@en . . .