Wow. Thats crazy. There was a Japanese soldier on the Island of Guam that when it was liberated in 1944 went into hiding and remained hidden until 1972, making him the last soldier in the war to surrender.

IIRC he was not totally alone, having gone into hiding with about a dozen other soldiers but most died pretty quickly. The last 3 separated after hiding about ten years together and they tried to hook up annually but he found them both dead in the early 1960s of starvation.

I lived on Guam for a bit, there was a very small museum for him, with some of this clothes and tools. He was a garment maker before being drafted so he made outfits from vines and coconut.

Lived in a tunnel in double canopy jungle, near a river living on shrimp, bananas, coconuts, roots and such. Was found by some local fisherman.

He had no idea the Japanese had surrendered. I recall he made a statement about the way airliners in the sky had changed. (Guam international airport located in the middle of the island, through the mid 1990s shared its runway with the US Navy. You'd see a 747 land, then a B-1 Bomber take off.)