Police foiled the attempted theft of £200m worth of diamonds on display at the tourist attraction in south London. The robbers were caught as they smashed their way into the Dome with a JCB digger and had planned their escape up the River Thames on a speedboat. But senior police officers, suspicious of a plan to steal the diamonds, mounted a sophisticated operation to thwart it. Five men were convicted in relation to the attempted robbery and received between five and 18-year sentences.