These are the clues I have found...
4 tunnels / 3 arches
Bring Peter, and have a BBQ with Sulphur for it will open the 1st tunnel. In it you will see 2 large chests, one containing Spanish uniforms. the other was half filled with Ore. There are 4 chairs and a long table in the middle. The room had a bad stench(I don;t know where it came from.) There were many more items.
The second tunnel has a door of iron. The lock is Spanish, the door is not. Pass the second door is a statue of Bronze Man 6ft tall (The Guardian)along with a wall of Spanish Armor hanging. Also there are Swords and books and a table with plates. Some small bones, musical instruments and ship sextant. also church artifacts.
The third tunnel is hidden among the walls, but it is said to contain a row of Gold Bars 30feet long and three rows deep. Here is the way to the site <> take 108 to 15 to 111. Then 88 to 49 to 12. Look north.
3 trees that are not native mark the entrance to the first tunnel. The first tree is praying, the second is the cross and the third is a rather large animal with an inscription spanish marker.
Hey! They shoot horses don't they