No Regret Secret room mission 3

[The Silencer]

There's one secret room on level 3 I just can't get to (and I can't remember ever getting there, though through hack mover I've long known it exists). This can be found at the very end of the first level, just before the lift door. Screenshot is included. The room is shown in the strategy guide. No rooms are round (checked with hack mover) so I think I have to teleport in somehow. Anyone ever solved this?

EDIT: The box holds the keycard to open that door to my south, the keycard can be found elsewhere also though.

 

[The Silencer]

Never mind, I found it. In the secret room behind the Vetron cube is an Energy Recharge station. Next to it is an unseen switch, that opens a wall door next to the power generator.