Theta | Riddles and puzzles of SOMA Game SOMA Guide and Walkthrough

You must use the pump to turn the power back on.

In the opposite corner of the room (looking from the entrance) you will see a small metal box. Take off the lid to uncover the mechanism inside - remember to put down the lid slowly and quietly, instead of throwing it in a random direction, or you will alert the enemy of your presence! Pull and push the lever a couple of times, until the bar on the right side is full, which will restore the power in the previous room. Go there, open the previously locked doors, enter the room and lock them behind you.