SM UB - 11 SM " UB - 11 " was a German Type UB I submarine or U - boat in the German Imperial Navy ( ) during World War I . " UB - 11 " was ordered in October 1914 and was laid down at the AG Weser shipyard in Bremen in November . " UB - 11 " was a little under in length and displaced between , depending on whether surfaced or submerged . She carried two torpedo es for her two bow torpedo tube s and was also armed with a deck - mounted machine gun . She was launched and commissioned as SM " UB - 11 " in March 1915 . " UB - 11 " s commanding officer at commissioning only remained in charge of the ship for a week . Sources do not report any more commanding officers assigned through the end of the war , so it ' s not clear if the submarine remained in commission . " UB - 11 " was reported in use as a training vessel at Kiel in September 1915 . The U - boat made no war patrols and sank no ships during the war , which may indicate that the vessel remained in a training role . At the end of the war , " UB - 11 " was deemed unseaworthy and unable to surrender at Harwich with the rest of Germany ' s U - boat fleet . She remained in Germany where she was broken up by Stinnes in February 1920 . Design and construction . After the German Army ' s rapid advance along the North Sea coast in the earliest stages of World War I , the German Imperial Navy found itself without suitable submarines that could be operated in the narrow and shallow seas off Flanders . Project 34 , a design effort begun in mid - August 1914 , produced the Type UB I design : a small submarine that could be shipped by rail to a port of operations and quickly assembled . Constrained by railroad size limitations , the UB I design called for a boat about long and displacing about with two torpedo tube s . " UB - 11 " was part of the initial allotment of seven submarines — numbered to — ordered on 15 October from AG Weser of Bremen , just shy of two months after planning for the class began . " UB - 11 " was laid down by Weser in Bremen on 7 November . As built , " UB - 11 " was long , abeam , and had a draft of . She had a single Körting 4 - cylinder diesel engine for surface travel , and a single Siemens - Schuckert electric motor for underwater travel , both attached to a single propeller shaft . Her top speeds were , surfaced , and , submerged . At more moderate speeds , she could sail up to on the surface before refueling , and up to submerged before recharging her batteries . Like all boats of the class , " UB - 11 " was rated to a diving depth of , and could completely submerge in 33 seconds . " UB - 11 " was armed with two torpedo es in two bow torpedo tube s . She was also outfitted for a single machine gun on deck . " UB - 11 " s standard complement consisted of one officer and thirteen enlisted men . After work on " UB - 11 " was complete at the Weser yard , she was launched on 2 March . Career . The submarine was commissioned into the German Imperial Navy as SM " UB - 11 " on 4 March 1915 under the command of " Kapitänleutnant " ( " Kapt . " ) Ralph Wenninger , a 25 - year - old first - time U - boat commander . Wenninger was only in command of " UB - 11 " for a week . Sources do not indicate who , if anyone , succeeded him as commander of " UB - 11 " , or if " UB - 11 " remained in commission . According to authors R . H . Gibson and Maurice Prendergast , " UB - 11 " had been assigned to the Kiel Periscope School by September 1915 . Uboat . net reports that " UB - 11 ' undertook no war patrols and had no successes against enemy ships , which may indicate that the vessel remained in use only as a training vessel . At the end of the war , the Allies required all German U - boats to be sailed to Harwich for surrender . " UB - 11 " was one of eight U - boats deemed unseaworthy and allowed to remain in Germany . " UB - 11 " was broken up by Stinnes on 3 February 1920 .