We have learned how to do archaeology in the Black Sea and we can use these techniques to do the same thing along the Pacific coast of the Americas, Pacific islands, and Australia. It will require better remote sensing technology, since finding ship wrecks via remote camera will not work for the next stage of exploration, but that will come.
Perhaps a search for sunken vessels of WWII might also turn up something ancient, but most of the large vessels sank in the western Pacific. There's not even any treasure hunting to speak of that could be undertaken, because most of the gold, silver, and emeralds dug out of Central and South America got shipped to Spain via the Atlantic (or went down in the Atlantic, or got privateered in the Atlantic).