The USS Grunion (SS-216) was commissioned April 11, 1942 and began her first war patrol off the Aleutian Islands where she sank two enemy patrol boats before being sunk by her own torpedo during an attack on a Japanese merchant ship.
2007 Abele Expedition:
In 2007, the stern of the USS Grunion was discovered. This expedition was led by the sons of the USS Grunion's commanding officer, Lieutenant Commander Mannert L. Abele. For more information on the original expedition visit Grunion Mystery Solved.
2018 STEP Expedition:
The 2018 STEP funded expedition located the bow section of USS Grunion down a steep volcanic embankment, about a quarter mile (0.4 kilometers) from the main wreckage.