PEARL HARBOR, Hawaii—The Navy has confirmed the wreckage of a sunken vessel found last year off the Aleutians Islands is that of the USS Grunion, which disappeared during World War II.

Underwater video footage and pictures captured by an expedition hired by sons of the commanding officer, Lt. Cmdr. Mannert L. Abele, allowed the Navy to confirm the discovery, Rear Adm. Douglas McAneny said Thursday in a news release.

The Grunion was last heard from July 30, 1942. The submarine reported heavy anti-submarine activity at the entrance to Kiska, and that it had 10 torpedoes remaining forward. On the same day, the Grunion was directed to return to Dutch Harbor Naval Operating Base. The submarine was reported lost Aug. 16, 1942.