Revisiting The Case
The submarine fired all of her torpedos within five days and successfully sank four Japanese ships before going back to Pearl Harbor. Commander Moore won himself a second Navy Cross. After staying in Pearl Harbor for nearly three weeks, Grayback went on her tenth mission on January 28, 1944.
Digging Through The Files
After February 25th there was nothing else heard from the submarine and on March 30th the ship was announced missing. The Grayback sunk around 21,594 tons of Japanese shipping during the final mission.