Black Rock Processing Control Bridge. What mission are you on. If you keep following the signs you will come to a giant abyss.
Its two walls of black rock over a bottomless pit with bridges and doors on either side. Continue towards Black Rock Processing in Control Youll see that your time in the Oceanview Motel has built a bridge from one side of the bottomless void to the other. First head to Central Maintenance using the sector elevator.
This time whoever the bridge from the Black Rock Processing door is extended and we can walk across.
So that big empty area with the bridges on either side is called a firebreak. To get there first direct to the site Tech Center. Once youre at the plant sprint around the perimeter of the domed area until you. Take the key and return back to your last position on your left there is a room with Black Pyramid on it.