This level occupies the map slot MAP14. For other maps which occupy this slot, see Category:MAP14.
From the map start go north. Approaching the berserk pack lowers a lift in front of you, releasing a (two on hard skill levels) revenant. Simply open the northern wall of his hideout to find a computer area map and a passage (sector 29) to the spectres' hideout. If you opened its south wall in advance, you can open the secret passage from here also.
Ride up the lift mentioned in secret #1 and exit the hallway through the western door. Outside, make a hairpin turn to the right. Push the switch in the dark slot right north of the door's steel beam to open a cache (sector 80) with a partial invisibility in the south of the door.
Enter the red teleporter in the southwest of secret#2, cross the wide open area and push the gargoyle switch in the northwest to lower the white teleporter that you use. Now go through the southernmost door, drop down into the moat and push the switch at the western end to release two hell knights. After killing them, instead of going through the southern new passage, enter the northern one and go through the fake wall at its end to find a bulk cell (sector 141).