Back in my early days (early 60s, I suppose) I remember a story I read in one of the popular magazines.
It involved a group of guys who located a sunken WWI German U-Boat. The sub was intact and not flooded, and what was left of the crew was still inside.
They managed to recover it and put it into working order. Their purpose was nefarious, probably piracy, but I don’t remember how the story turned out.
But I was more intrigued by the sub itself, and what they found inside!
I’m assuming it was a work of fiction?