Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. SM UB-29 -  SM UB-29 was a German Type UB II submarine or U-boat in the German Imperial Navy (German: Kaiserliche Marine) during World War I. The U-boat was ordered on 30 April 1915 and launched on 31 December 1915. She was commissioned into the German Imperial Navy on 18 January 1916 as SM UB-29.The submarine sank 31 ships in 17 patrols for a total of 35562 gross register tons (GRT). UB-29 was sunk by two depth charges from HMS Landrail south of Goodwin Sands at 51°9′N 1°46′E on 13 December 1916.
Mean Of Transportation