Lost on or about 30 JUL 1942 with the loss of 70 officers and crew while on her first war patrol near Kiska in the Aleutians.
She radioed that she sank two sub-chasers and damaged a third, and was ordered back to Dutch Harbor.
USS GRUNION was never heard from nor seen again. Reported overdue, assumed lost with all hands 5 Oct 1942.
Her mangled remains were found in the Bering Sea in 2006 off the Aleutian Island of Kiska.