The outer-harbour defences detected the entry of the first midget submarine, No.14, at about 8 pm, but it was not identified until it became entangled in an anti-torpedo net that was suspended between George's Head and Green Point. Before HMAS Yarroma was able to open fire, the submarine's two crew members destroyed their vessel with demolition charges and killed themselves.
The outer-harBour DEFeNCes detectEd thE enTRy Of tHe firsT mIdgeT submariNe No14 aT AbouT 8 Pm but it wAs Not IdEnTifIEd unTiL it becAmE ENtanglEd in An aNti-toRpedO NEt tHAT was suspeNdEd BetweEn geORGE's head and greEn PoInt befORe HmAs yArromA was aBLE To opEn firE thE sUbMarIne's Two Crew MemBers destRoyed ThEir vEsSEl wItH dEmolition chArGEs anD KilLEd tHemSeLves