The Type VII was a series of German attack submarines used by the Kriegsmarine during World War II. With a range of over 7,000 nautical miles, it was designed to operate in the Atlantic Ocean and Mediterranean sea. It was the most widely produced U-boat type, whose pruduction surpassed the 700 submarines, with the VIIC version being the most numerous (510). Equipped with an active sonar, the Type VIIC submarines inflicted heavy damage on the British maritime supplylines, which were on the verge of being totally severed by early 1943. However, the two most successful submarines of this series were two Type VIIB U-boats: the U-48 and U-99, which sank 52 and 38 enemy ships of all kind respectively, during the war. Attacking in groups of several subs, known as wolfpacks, Type VII U-Boats became legendary submarines that almost gave Germany a decisive victory in World War II, sinking millions of tons of merchant ships and several hundreds of Allied warships. They communicated with one another using the Enigma machine. The Type VII U-boats were characterized by a fast dive capability, being able to disappear from the surface of the sea in less than twenty seconds.
14 torpedoes launched through 533mm torpedo tubes, 39 TMB mines, and one naval gun on deck.
Type: attack submarine
Length: 67.1 m
Beam: 6.2 m
Draft: 4.7 m
Displacement: 870 tons (submerged)
Power plant: two supercharged Germaniawerft, 6-cylinder diesel engines, 3,200 hp
Speed: 17 knots (surface); 7.6 knots (submerged)
Range: 7,000 nm (14,000 km)
Crew: 52 officers and sailors