Secret Places (5)
Up in the office building, when you activate the switch to get the blue access card, you're also opening a secret place in the room. The framed picture will open to reveal a devastator. You can't see the secret place in this image, just the switch to open it. It's easy enough to find. Just turn around and look at the left wall.
The ATM machines are actually doors to a secret place.
Upon entering the bank, turn right and shoot the orange switch near the ceiling. Turn around and you'll see a hidden area where the phones used to be.
In the bank, keep an eye out for this framed picture. It's another hidden door.
In the gearlock area, find the gamma gear. Twist it anti-clockwise to reveal a red crack in the wall. Blow it up to find the final secret place.