Grunion entered service with the US Navy in April, 1942, and had already claimed the sinking of two Japanese warships on its first combat patrol.
On 30 July, after reporting intensive anti-submarine activity, it was ordered back to base at Dutch Harbor.
Its final reports were of firing on an enemy ship, now thought to have been the merchant vessel Kano Maru. It is believed that the loss of Grunion could have been the result of multiple torpedo failures.
Lost 52 Project says it hopes that the discovery of the bow will help to solve the mystery of what happened to the submarine and its 70 crew. Describing the “fly-through” 3D depiction of the wreck, Bruce Abele, one of the submarine commander’s three sons, said that it had “had a profound impact on me, one exactly as intended by the Lost 52 Project.
“Seeing the entire wreck in contrast to only a portion creates a real-world experience of what went on. When you see only a portion of a wreck, the level of certainty is diminished.”