File:German Type UB I submarine.jpg

Summary
{{Information
 * Description={{en|In the Williamson book this image is identified as depicting {{SMU|UB-4}}, which was launched in April 1915 and sunk in August 1915}}
 * Source=* {{cite book | last = Herzog | first = Bodo |first2=Helmut|last2=Fechter| title = Deutsche U-Boote: 1906–1966 | language = German | location = | publisher = Erlangen Müller | year = 1993 | isbn = 9783860700365 | oclc = 165221847 }} via http://www.dreadnoughtproject.org/models/ships/SMS_UB_2/photos/ (direct picture link)
 * {{cite book | last = Williamson | first = Gordon | title = U-boats of the Kaiser's Navy | location = Oxford | publisher = Osprey | year = 2002 | isbn = 9781841763620 | oclc = 48627495 | page = 12 }}
 * Date=1915
 * Author=Unknown
 * Permission=