It appeared in four sub-types. ==Background== Germany was stripped of its U-boats by the Treaty of Versailles at the end of World War I, but in the late 1920s and early 1930s began to rebuild its armed forces.
It appeared in four sub-types. ==Background== Germany was stripped of its U-boats by the Treaty of Versailles at the end of World War I, but in the late 1920s and early 1930s began to rebuild its armed forces.
{| |} The Type II U-boat was designed by Nazi Germany as a coastal U-boat, modeled after the CV-707 submarine, which was designed by the Dutch dummy company NV Ingenieurskantoor voor Scheepsbouw Den Haag (I.v.S) (set up by Germany after World War I in order to maintain and develop German submarine technology and to circumvent the limitations set by the Treaty of Versailles) and built in 1933 by the Finnish Crichton-Vulcan shipyard in Turku, Finland.
The net cutters were adopted from World War I boats but were quickly discontinued during World War II. Deutsche Werke AG of Kiel built six Type IIAs in 1934 and 1935. ===List of Type IIA submarines=== The prototype, built in Finland: Finnish submarine Vesikko ==Type IIB== The Type IIB was a lengthened version of the Type IIA.
The pace of rearmament accelerated under Adolf Hitler, and the first Type II U-boat was laid down on 11 February 1935.
This agreement was signed on 18 June 1935, and was commissioned 11 days later. ==Design== The defining characteristic of the Type II was its small size.
The net cutters were adopted from World War I boats but were quickly discontinued during World War II. Deutsche Werke AG of Kiel built six Type IIAs in 1934 and 1935. ===List of Type IIA submarines=== The prototype, built in Finland: Finnish submarine Vesikko ==Type IIB== The Type IIB was a lengthened version of the Type IIA.
Diving time was also improved to 30 seconds. Deutsche Werke AG of Kiel built four Type IIBs in 1935 and 1936; Germaniawerft of Kiel built fourteen in 1935 and 1936; and Flender Werke AG of Lübeck built two between 1938 and 1940.
Diving time was also improved to 30 seconds. Deutsche Werke AG of Kiel built four Type IIBs in 1935 and 1936; Germaniawerft of Kiel built fourteen in 1935 and 1936; and Flender Werke AG of Lübeck built two between 1938 and 1940.
The additional diesel tanks beneath the control room were further enlarged, extending the range to 1,900 nautical miles at 12 knots. Deutsche Werke AG of Kiel built eight Type IICs between 1937 and 1940. ===List of Type IIC submarines=== There were eight Type IIC submarines commissioned. ==Type IID== The Type IID had additional saddle tanks fitted to the sides of the external hull.
Diving time was also improved to 30 seconds. Deutsche Werke AG of Kiel built four Type IIBs in 1935 and 1936; Germaniawerft of Kiel built fourteen in 1935 and 1936; and Flender Werke AG of Lübeck built two between 1938 and 1940.
Diving time was also improved to 30 seconds. Deutsche Werke AG of Kiel built four Type IIBs in 1935 and 1936; Germaniawerft of Kiel built fourteen in 1935 and 1936; and Flender Werke AG of Lübeck built two between 1938 and 1940.
The additional diesel tanks beneath the control room were further enlarged, extending the range to 1,900 nautical miles at 12 knots. Deutsche Werke AG of Kiel built eight Type IICs between 1937 and 1940. ===List of Type IIC submarines=== There were eight Type IIC submarines commissioned. ==Type IID== The Type IID had additional saddle tanks fitted to the sides of the external hull.
Only one of these submarines survive; the prototype CV-707, renamed Vesikko by the Finnish Navy which later bought it. On 3 February 2008, The Telegraph reported that a U-20 had been discovered by Selçuk Kolay (a Turkish marine engineer) in of water off the coast of the Turkish city of Zonguldak.
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