I just concluded a decade long experiment. I had a USB flash drive in a jar buried in my back yard since 2015. I dug it up, plugged it in and it suffered no data loss after 11 years idle underground.

It's a usless experiment but everyone needs hobbies.

@Aaron_DeVries I'm sure this will also work for any other functioning USB drive that's hermetically sealed against most elements, agents, and phenomena for an arbitrary length of time. Like if I put my car in a museum, instead of using it.