Black Rock Processing Control Bridge. From the Atlas Chamber head toward Black Rock Processing and hang a right into the corridor behind the Clearance Level 5 door and then Levitate through a hole in the. Open the door to the Black Pyramid room and pull the light cord three times.
Your first task - to get to the Black Rock Processing. Open the door to the Black Pyramid room and pull the light cord three times. First head to Central Maintenance using the sector elevator.
Continue to Atlas Chamber the big door will open right in front of you.
Go through the Security Check and follow the sign for the Atlas Chamber and Black Rock Processing. Find a Black Rock Prism in Control. Approach and interact with the glowing red box on the right-hand side. If you keep following the signs you will come to a giant abyss.