In this segment of Secrets of Scotland Yard, learn about how Scotland Yard foiled a plot for a major armed robbery in 2000. The Yard used video surveillance to monitor the suspected gang's activity and were able to narrow down the target to the Millennium Diamond in the Millennial Dome by the River Thames. Watching crowds entering the Dome required the largest secret surveillance operation in the Flying Squad's history. The plan to defy the best criminal brains was complex and detailed, using all of the Flying Squad's detective techniques to apprehend the robbers. [7:28]