The sub's machine guns scored hits in the forward engine room and several scattered and harmless hits near the bridge, and her deck gun crew traversed their 88 mm gun and took aim for their first shot at Borie'''s waterline; but Borie'''s 20 mm gunfire killed every exposed member of the sub's crew topside, and a salvo of three 4-inch shells then blew off the sub's deck gun before it fired a round.