How do I escape the security office?

You'll need to find a way to unlock the door to the deck (thanks Calvin)

Go into the chief's office. There's a remote door (un)locker on the table.

If only you knew the code. Thankfully there are some clues around.

Notice a pattern in the pictures next to the exit?

The chief doesn't seem to like his son-in-law, Walter.

In fact, it would be safe to say he Hates him.

Or H8s him?

Use the arrows to input I H 8 W A L T E R into the unlocking device. Press the lock/unlock button.