11 - Point of no Return WH40K: Space Marine Guide
Last update: 11 May 2016
You'll get to the room with cables. Kill orcs you find inside [1] and bring the power back [2].
Nearest stairs leads you to a mechanism, which let you launch a powerful cannon [1]. A moment later forces of chaos show up [2].
When cut-scene ended, defeat small demon's squad [1] and get to the elevator [2].
Downstairs even more fighting is waiting for you, but enemies shouldn't be troublesome [1]. Moving forward and eliminating hordes of enemies, you'll get to the exit from the laboratory [2]. A while later stage ends.