Black Rock Quarry Restricted Area. Darling Dimensional Staffing Correspondence. Approach and interact with the glowing red box on the right-hand side.
This would lead you to a mold-infested area. As a Threshold the Black Rock Quarry is connected to an alternate. Black Rock Quarry Portishead BS20 8JY United Kingdom.
Finnish Tango the one that gave me Ahtis casette player.
Your destination is located in the Maintenance Sector - this is a Restricted Area shown in the picture above. In the corridor north of the entrance to the quarry go down the back path and avoid the entity then go to the dead end to find the collectible. Continue down the almost pitch-black cavern with serious X-Men vibes and several other doors will unhinge to let you into Black Rock Processing. If you dont have an unlocked fast travel point start at the Black Rock Quarry located south of the Forbidden Zone.