, a Type U 51 submarine launched in 1916 and that served in the First World War until surrendered 26 November 1918; in service as Japanese submarine O-3, 1920–21; dismantled at Sasebo, March–June 1921; briefly recommissioned as Auxiliary Vessel No.
, a Type U 51 submarine launched in 1916 and that continued to serve until it was surrendered on November 26, 1918; later served as Japanese submarine O-3 from 1920–21; dismantled at Sasebo between March and June 1921; briefly recommissioned as Auxiliary Vessel No.