Surveillance
On 1 September 2000 the flying squad identified three of the suspected robbers, Wenham, Betson and Cockram at the dome. They were observed visiting the exhibition and recording video footage. As a result of the men being observed at the exhibition, the police began to suspect that the exhibition could be a target. The surveillance on the men was significantly increased and the dome was placed under close watch. The precautions taken by the flying squad included replacing the priceless gems with replicas of the same size. This allowed for the originals to be stored elsewhere. Due to an increase in surveillance, the police discovered other members of the gang. These included Terry Millman who was tasked with obtaining the getaway speedboat which was to be used for the escape. William Cockram and Raymond Betson were also observed filming the surrounding river and jetty. The surveillance on the gang continued and their visits to the dome became more frequent. In late September a few members of the gang were spotted testing a speedboat in a harbour in Kent.
Read more about this topic: Millennium Dome Raid