Black Rock Quarry Control. Pick up the Security Clearance Level 5 and go through the door and into the service elevator. There is no control point in this area but there is one nearby.
As a Threshold the Black Rock Quarry is connected to an alternate dimension the night sky of which can be seen. Be prepared for this battle because a. The Quarry Threshold also known as the Black Rock Quarry is a Threshold located in the Maintenance Sector of the Oldest HouseThe Federal Bureau of Control uses the quarry to mine for Black Rock a material highly valuable to them due to its ability to negate paranatural effects.
In the Black Rock Quarry your goal is.
You want to start at the Quarry Entrance. Pick up the Security Clearance Level 5 and go through the door and into the service elevator. On the table next to the TV you will find access card 5. Use the Levitate ability to reach the northern part of the quarry.