Well i have something to add on here...
Second movie the very beginning there was an island with a long bridge connecting two towers so they looked like where prisoners came in my friends. Without a doubt these here ravens came in and attacked the prisoners in the cages the mines that we see here could be what was possibly behind those huge doors. El Patron could have been a major enemy of the EITC and taken to these very mines where he died while attempting to escape where his cursed sword remains hidden in those very mines where the ghosts of the prisnors killed there roam and know no mercy and Beckett's men searching for Patron's lost sword so he can finish off any mother's son who calls himself pirate.
Just thought i'd take a little movie history and twist it into this story not sure if its true or not but seeing these maps is what i believe happens.
