malko, big mistake talking about it.
True story:
When Mr. AE's kid brother was diving off Playa Najayo, around 1978 or so, he called us in NY all excited. He had found a couple of cannons that were too large to move, and a chest/cabinet of some sort with it. He described the dimensions and asked Mr. AE [also a diver, but older and more experienced] for his advice on what to do. First thing he told is was NOT to tell ANYONE that he found them. Well, that ship had already sailed, he was so excited that he had 'mentioned' it already.
When he went back down to the site, with a couple of diving buddies, the chest and one of the cannons were gone. There was never a whisper anywhere about who took them or what was in the chest.