The Silent Threat

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Beneath the waves of the Thames Estuary a World War Two shipwreck hides a deadly secret. The SS Richard Montgomery ran aground and sank near Southend in 1944, taking with it a cargo of an estimated 1,400 tonnes of unexploded munitions. More than 80 years later, the bombs remain trapped within the wreck and could explode at any moment. Picture credit: Mitchell/Daily Express/Hulton Archive/Getty Images.