Black Rock Quarry Hidden Area. Hidden Location 8 Transit Corridor South 406 Look for an office window up along the wall. Black Rock Quarry Hidden Location.
This whole way is to get you to that big area on left side of the map called Black Rock Quarry. After that its just being a floaty gurl. In the room just past the Black Quarry Entrance Control Point the one where all the monsters and Hiss attack you is a doorway located above everything to the left.
Use Levitate to climb the platforms and then follow the sewers until you find a door that leads you back to the Furnace Chamber.
This marks the end of our Control Hidden Locations Guide. Darlings Black Rock Lab head upstairs and open the chest youll find there. That might be one where you have to find some good upgrades to your gunsabilitys and come back when you are more powered up. This whole way is to get you to that big area on left side of the map called Black Rock Quarry.