The parking lot at CIA headquarters is enormous.
Before entering the parking lot, one has to pass a checkpoint, but that's too easy. Fisher stopped the car, allowed the first security guard to check inside, showed everyone's ID, and then got clearance.
When entering the CIA headquarters building, everyone has to verify their identity, especially those who have never been there before. Their credentials need to be closely inspected.
However, Fisher led Gao Yi and his team through the back entrance—exclusively for catering staff, cafeteria workers, and janitors. It's not a route for agents, but it serves people who support the agents.
It leads to the CIA headquarters just the same, and still requires inspection. Technically, it's not considered a normal channel, but it's not far off either.
However, entering at five in the morning makes one incredibly conspicuous.
