A Game of Cat and Mouse
During this wartime patrol, the Grayback was part of the cat-and-mouse game that lasted three times with a Japanese submarine. Once the U.S. sub escaped the Japanese’s attention, the Grayback achieved a great victory when she sunk her first ship.
The South China Sea
The Grayback was later dispatched into the South China Sea, which was home to seas that were difficult to navigate. However, the submarine was able to hit an enemy sub and some merchant ships. After this, she began her fifth patrol and set off for Australia.