Black Rock Processing Control Bridge. Head through the door to Black Rock Processing deal with the goons inside the security room and instead of going through the door with the chasm head into the Turbine Room. Remedys adventure is a bewitching bewildering time.
Find a Black Rock Prism in Control. To get to the Black Rock Processing area in Control you need to build yourself a bridge. Eliminate the enemies in the security room.
Find a Black Rock Prism.
Head through the door opposite the Field Training to reach the Access Corridor which leads to Black Rock Processing. So the first step is to finish the Main Mission Old Boys Club at the end youll get clearance level 4 which youll need. Its two walls of black rock over a bottomless pit with bridges and doors on either side. Go to the premises leading to your goal and you will realize that the bridge has not been lowered.