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Photographed from a powered hang glider microlight aircraft, the remains of the U-boat are clearly visible in the mud below. Experts believe that the U-boat, which is the only visible wreckage of a U-boat in the UK, might be the UB122 which was launched in February 1918. The vessel was surrendered nine months later - having undergone just two unsuccessful patrols. The vessel was among 100 U-boats that were brought to the River Medway to be scrapped after the First World War.