Photographer Dean Sewell documented the fall of the Soviet Union in 1996 but did not develop his film for 26 years.
via PetaPixel: https://petapixel.com/2022/07/17/lost-film-rolls-of-the-fall-of-the-soviet-union-developed-26-years-later/
Australian photographer Dean Sewell spent 15 months in Russia after the breakup of the former USSR. When Russia invaded Ukraine, he was suddenly reminded that he still had more than two dozen undeveloped B&W film rolls from 1996 to 1997.