Nkọwa okwu dị mgbagwoju anya nke ahịrịokwu a bụ " U-boat German U-15 " bụ ụdị IIB U-boat nke " Kriegsmarine. "
N'ezie, ihe dị mgbagwoju anya nke ahịrịokwu ahụ bụ "ụgbọ mmiri German 'U- 15' bụ ụdị IIB U-boat nke German 'Kriegsmarine', nke enyere ọrụ na Machị 7, 1936 na-esote owuwu na Deutsche Werke shipyards na Kiel. "