The big screen in the security room is still on. It shows the two turnstiles in the lobby and the glass doors, the clock in the top-right corner ticking over second by second. At morning rush hour there would have been a line at the turnstiles, the beeps coming one right after another.

What you thinkA shift handover sheet is clipped to the console below the screen. The last entry reads: "Site closed from Friday. No visitors admitted. All staff enter and exit by badge only." The outgoing guard signed it. The line for the incoming guard is blank.

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