"But the underground conveyor system became clogged because staff failed to remove luggage quickly enough at the final unloading stage. So the system shut down. It's like a shopper putting too many goods on the supermarket check-out belt."
Because the baggage transfer area is tightly secured (we hope), there are no clandestine videos available from passenger cellphones. However, the following queue-theoretic simulation reveals what likely happened.
Click on the image to start the simulation.