were to move under the Bridge and attack a battleship and large cruiser believed to be in the inner harbour. When the second reconnaissance flyover revealed that the expected British battleship——was nowhere to be found, USS Chicago became the priority target. After completing their mission, the midgets were to depart Sydney Harbour and head south for to the recovery point off Port Hacking. Four of the mother submarines would be waiting in an east–west line long, with the fifth waiting further south. Attack Midget submarine M-14—launched from I-27—was the first to enter Sydney Harbour. The Middle Head – South Head loop detected it at 20:01, but dismissed the reading due to heavy civilian traffic. At 20:15, a Maritime Services Board watchman spotted the midget after it passed through the western gap, collided with the Pile Light, then reversed and trapped its stern in the net. The submarine's bow broke the surface; the watchman rowed toward it to determine what it was and then rowed to the nearby patrol boat to report his finding. Despite efforts by Yarroma to pass on this information, Sydney Naval Headquarters did not receive the report until 21:52. HMAS Yarroma and were dispatched to investigate. Upon confirming that the object in the net was a "baby submarine", Lolita dropped two depth charges while Yarromas commander requested permission from Sydney Naval Headquarters to open fire. The depth charges failed to detonate, as the water was too shallow for the hydrostatic fuse setting. At 22:35, while Yarroma was waiting for permission to fire, and Lolita was setting up to deploy a third depth charge, the two crewmen on M-14 activated one of the submarine's scuttling charges, killing themselves and destroying the submarine's forward section. Muirhead-Gould gave the general alarm, along with orders for ships to take anti-submarine measures, at 22:27; the alarm was repeated at 22:36 with advice for ships to take precautions against attack, as an enemy submarine might be in the harbour. At the time of the first alarm, Sydney Harbour was closed to external traffic, but Muirhead-Gould ordered ferries and other internal traffic to continue, as he believed that having multiple ships travelling around at speed would help force any submarines to remain submerged. Midget submarine M-24 was the second to enter the harbour. HMAS Falie grazed M-24s hull and reported the contact to command. The report was not followed up. M-24 crossed the indicator