Black Rock Quarry Control. Use Levitate to climb the platforms and then follow the sewers until you find a door that leads you back to the Furnace Chamber. Use the Levitate ability to reach the northern part of the quarry.
Along the way take another checkpoint. Theres also the Black Rock Quarry to which we can get using the Sector Elevator down to the Maintenance Sector Access Corridor then through the NSC Control Room and on to. As soon as you get there via the control point avoid the two Astral Spikes a head.
Pick up the Security Clearance Level 5 and go through the door and into the service elevator.
Im going mad trying to find the entrance. Continue until you reach the next elevator leading this time to the excavation site. Now you need to find the Black Rock Quarry. Take down the enemies ahead and keep pressing forward.