Oh, interesting, I didn't have a sense of how widespread that was.
I remember this 300-year-old Spanish shipwreck that was dredged up by a private company. The Spanish government then sued and won. They had to give back ~500k coins. https://www.bbc.com/news/world-44302476
I'm not sure how I feel about the outcome. In particular it seems odd that Spain could indefinitely claim ownership, even if they have no intention of recovering the wreck. That being said, I don't strictly believe "finders keepers" applies here either.
