frankfurt germany thyssenkrupp offer assistance argentinian authorities investigation disappearance submarine last month spokesman say friday ara san juan deliver 1985 build unit thyssen ag merge krupp form thyssenkrupp 1999. offer support technical investigation tragedy contact argentinian navy respect spokesman say say maintenance submarine conduct thyssenkrupp submarine go miss nov. 15 44 crew members aboard south atlantic water navy say nov. 27 water enter submarine snorkel cause battery short circuit go miss tragedy underscore critics describe parlous state argentina military face dwindle fund years german magazine wirtschaftswoche early report delegation argentinian navy travel kiel northern germany discuss question submarine thyssenkrupp identify source argentinian president mauricio macri call serious deep investigation incident thyssenkrupp offer help argentina disappear submarine