A sonar contact made earlier had been lost during the course changes required by the mine threat, but "Underhill" regained contact and guided "PC-804" into a depth charge attack with no immediate results. A few minutes later, however, a sub was sighted on the surface in the area where "PC-804" had attacked. "Underhill" set course to ram, but the sub dived and the command was changed to drop depth charges. A 13-charge pattern was laid, explosions brought up oil and debris, and "PC-804" reported a kill.