KMS SM U-1

SM U-1, also known in English as the German Type U1 Submarine, was the first U-Boat class of the U-boat series of submarines for the German empire's Imperial German Navy. Only one was built. The U-1 was constructed by Germaniawerft in Kiel and was commissioned of 14th December, 1906. When WW1 Began in 1914, the U-1 was deemed obsolete and was only used for training until 19th February 1919, when it was struck and sunk by another vessel whilst on an exercise.