[pierrem15]

But Spain does dispute ownership when the wrecks are found with treasure and wins their cases (Portuguese waters):

https://www.cnn.com/2012/02/01/world/europe/spain-u-s--treasure-dispute/index.html

There are some Florida ones also I believe.

[jimtorr]

Well, yes, Spain does sometimes dispute ownership, but the only cases they win, as far as I know, is when the wreck is near Spanish waters.