Because part of our job as a strategy guide is to relieve your stress, we’ll tell you here that although Alistair’s chilling tone with Nikola adds a sense of urgency to your trek through the Catacombs, don’t worry—this is not a timed game sequence. Turn left at the next fork (23) and follow the tunnel into another pillar-lined room.
Note the action icon on the boarded-up doorway, but don’t approach it yet. First, veer into the alcove to the right and inspect the photograph (24) sitting on the wooden crate. It depicts a “Cargo Delivery, Westminster Catacomb.”
Now go back and press 
to shoulder-bash through the boards over the doorway (25). Proceed to the end of the passage, turn left, and traverse up the wall (26) to the opening. You’re almost there!
And of course it makes perfect sense that the final doorway leading into Tesla’s lab would require use of Tesla’s TS-27 Inverter/Rectifier device to disable its power box. Open the door to trigger the start of the game’s final chapter.
