09 Feb 45: British submarine HMS VENTURER sinks U-boat U-864 west of Bergen, Norway. This is history's only known, publicly acknowledged battle where one submerged submarine sank another. More: http://scanningwwii.com/a?d=0209&s=450209 #WWII
NOV 2 1944 A U boat Captain returns to bombed out Germany A German picture of the U boats in their massive concrete bunker at Brest in 1942. It was not until 1944 that the RAF developed bombs capable of penetrating them.