Type VIIC U boat is a German submarine force, which is the most famous models, built from 1940 the first water service U-69 until the end of the war in 1945 produced a total of 568 aircraft .Although the VIIC type U boat voyage no larger in IX class U boat to long, but the war was almost used in all U boat combat range.VIIC the initial investment of time point in submarine force in the early days of World War II, the most high-profile record “the first happy time”, later also experienced in the east coast of the United States against “second happy time”, until finally in the late 1943 by Allied anti-submarine forces defeated.