Deus Ex: Human Revolution Hints

Is there a way to know this door's security code?

  • 1 of 4: It's on a nearby pocket secretary.
  • 2 of 4: One of the two guards near your cell has it.
  • 3 of 4: If you didn't knock them out and loot them earlier, you might want to sneak back and do that now. Or just read on for the answer.
  • 4 of 4: The code is 3713.