13-3-74 Soldier returns to Tokyo after 30 years of hiding in the Philippines (youtube.com)

Related article: https://www.nytimes.com/2014/01/18/world/asia/hiroo-onoda-im...

This Hardcore History episode starts with that story (or one very similar to it):

https://www.dancarlin.com/product/hardcore-history-62-supern...

Very interesting and worth the listen.