User blog comment:Midhav/Shoutbox/@comment-1742432-20110409035406/@comment-4898132-20110414213227

Actually, from what my source say...the chalices do something different:

''To make the Fountain work, a person needs the Chalices of Cartagena. Then, when the chalices are filled with the water from the Fountain, two persons must drink from them. One person will become older, and the other one will become younger.''
 * When the 2 persons drink from them, the one who drinks the chalice with a mermaid's tear takes the life of the one drinking from the other chalice(which just has the Fountain water).

''The both chalices are kept in a treasure chest on the Santiago, Ponce de Leon's ship. The ship is now just a wreck on the shores of Florida. Jack will get one chalice, and the Spanish will get the other. And they are called the Chalices of Cartagena because they were stolen from Cartagena shortly before Ponce de Leon sailed for the New World.''
 * The Santiago is actually in the middle of the jungle...shockingly enough(even though you kinda see it dangling on a cliff in this image). And the chalices were in the chest until someone takes both chalices away. As to who takes them away, I cannot say(without spoiling big time, lol).