Kammala wannan jumla: A cikin biyar patrols a cikin watanni shida aiki, "UB-45" sunk hudu jiragen ruwa na. A farkon Nuwamba 1916, "UB-45" yana tashi daga tushe a Varna, Bulgaria, lokacin da jirgin ruwan U-boat ya buge ma'adinai kuma ya nutse da sauri. Goma sha biyar daga cikin mutane ashirin da ke cikin jirgin sun mutu a harin; daya daga cikin ma'aikatan jirgin biyar da aka ceto daga "UB-45" daga baya ya mutu daga raunin da ya ji. "UB-45" ta wreck da aka located da kuma dauke da
Sojojin ruwan Bulgarian a cikin 1930s tare da ido ga sake gina jirgin ruwa. Injiniyoyi daga AG Weser sun ƙaddara cewa sake gyara jirgin ruwan yana yiwuwa, amma ba a taɓa yin hakan ba. An binne ragowar da aka gano daga jirgin da ya lalace a Varna bayan wani jana'izar jana'izar ta hanyar gari a watan Nuwambar 1938.