Type VIIC - the workhorse of German U-boat force (568 commissioned from 1940 to 1945). Type VIIC differed from VIIB only in the addition of an active sonar and a few minor mechanical improvements, making it 2 feet longer and 8 tons heavier. Speed and range were essentially the same. Many of these boats were fitted with snorkels in 1944 and 1945. The most famous VIIC boat was U-96, featured in the movie Das Boot.
Type IXC - long range patrol with an additional 43 tonnes of fuel. 54 were built.
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