With over 650 boats build, the Type VII was the most important submarine in the German Kriegsmarine. Built between 1936 and 1944 those boats mainly operated in the North Atlantic, and were known for the so called "Rudeltaktik" - a simultaneous night attack of several surfaces U-Boats on allied convoys. Besides torpedo attacks they could also be used for mine laying and were well known for their maneuverability and fast diving speed. Shortly after the introduction of the first model a improved version with a better maneuverability (Type VIIB) was built. The most built variant was the Type VIIC whose variant Type VIIC/41 was made of thicker steel to increase the diving depth. Other variants include the mine laying Type VIID and the torpedo supply variant Type VIIF. Today, one of those boats, U995 , is on display in Laboe, Germany.