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Yes. Here is a cautionary tale even for treasure hunters operating in deep, international waters: https://www.theguardian.com/world/2012/feb/01/treasure-trove-galleon-returned-spain

I remember when all that went down. It was an odd case that changed precedent. If I recall correctly, the US did nothing when Spain forcefully boarded a ship flying the US flag. Too bad, if true. It turned into political maneuvering.
The Odyssey owners learned their lesson though, and make a contract with the claiming country before salvaging now.

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