I wish I knew the answer to that question and some of the guys over on the Shipwrecks forum, may be able to answer that! From the different sizes of cannon shot (not the lead balls which are apparently Pistol and possibly Rifle shot) that I could see in the pics, my question is, what kind of ship would have been that heavily armed with such an assortment of different sizes of cannons. Is it possible that the ship was not a Pirate ship and was actually a heavily armed and heavily treasure laden ship, I truly believe so and hope so! For this reason, it is so much more important to bring up one or more of the sewer pipes, in hopes that the identity of the ship can be established and if there was/is a manifest, you will know what truly lays on the bottom and how big of a Super Yacht you will be able to afford!
Frank