When millions, or billions of dollars are at stake you can count on the courts impeding forward progress for the finders. Everyone wants a piece of the pie. Happens all the time. It's all about money + a small amount of pride. When you have a government with lawyers on retainer, or doing squat - filing and pursuing a legal case is no big shakes. In the end, the Spanish government will probably lose, but why not take a stab at it? Maybe you reach a joint fiscal agreement by tying up the the salvors so much that they want to settle? If you win a little, it sets a precedent for someone else.
My personal feeling is that you keep your discovery quiet as possible until you get everything squared away & enjoy your booty privately until you are old and gray. Leave the secrets to someone else when you are dead and gone! Sadly, this is rarely the case as someone is always watching!
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