ping
All such rulings do is make it certain that the next time a salvage is done, the salvage company will make d@mn sure to extract the jewels, then melt down the gold and silver, losing all historical value due to government greed. Afterwards, they will claim the salvage has been a bust, and they will sell the untraceable valuables on the world black market.
After all, the Spanish (or any other government) has abandoned the property long ago. And abandoned property should go to the finder. I personally think it was idiotic to agree to such a treaty. As a minimum, the treaty should have included a sharing clause, requiring the salvager to be be paid 100% of their costs of the salvage and the research, plus a reasonable profit percentage, and then receive a share of the salvage.