Uncharted : The keys weren't even needed? (spoilers)

The keys weren't even needed? (spoilers)

These keys costing millions of pounds to acquire and apparently the entire source for the treasure, they weren't even needed?

They go to the church, open a door, go to a nightclub, open another door, nearly get drowned, go through another door. And get to an area literally accessible and viewable by a drain vent from the street (How did the local council not see all of this when installing that drain vent in the street?

If I was the characters I would be saying, what was the point in all of that….

I was in the movie thinking, what a complete waste of time.