The SS Richard Montgomery is an American warship from the second world war that sunk in the river Thames just outside of London. Her cargo contains 1400 tonnes of dynamite and other explosives. If the ship ever explodes, it will take the city with it. On board is an assortment of more than 9,000 US-made explosives (around 1,400 tones). These include 286 giant 2,000lb ‘blockbuster’ bombs, 4,439 1,000lb devices and more than 2,500 cluster bombs. Cluster bombs would have been transported with their fuses in place, leaving them more prone to accidental detonation.