World War II in Pictures: Type XXI U-Boat, Forerunner of Modern Submarines(04) Save Image Image gallery: German Type Xxi U Boat
![Type XXI submarine - Wikipedia](https://upload.wikimedia.org/wikipedia/commons/thumb/f/f3/U-Boot_Typ_XXI_U-2540_("Wilhelm_Bauer")_(9447881765).jpg/440px-U-Boot_Typ_XXI_U-2540_("Wilhelm_Bauer")_(9447881765).jpg "Type XXI submarine - Wikipedia")
