I've inherited a half finished bath remodel. The shower panel mounting brackets are installed and there is an empty 2 inch diameter hole, 3 feet off the floor. The original shower head / handle was on the same wall. There is hardibacker behind the porcelain tiles.
Without causing too much damage, how can I find the cold/hot connections and attach them to my shower panel?
Edit: This is the adjacent wall. Some of you suggested to go from this side. The toilet is about the same height as the shower hole.