SM UB-1 (became the Austro-Hungarian U-10, July 1915) SM UB-2 SM UB-3 SM UB-4 SM UB-5 SM UB-6 SM UB-7 SM UB-8 (became the Bulgarian Podvodnik No. 18, May 1916) SM UB-9 SM UB-10 SM UB-11 SM UB-12 SM UB-13 SM UB-14 SM UB-15 (became the Austro-Hungarian U-11, June 1915) SM UB-16 SM UB-17