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02/08/1870 Tower Subway opens in London

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The Tower Subway is a tunnel beneath the River Thames in central London, between Tower Hill on the north side of the river and Vine Lane on the south. In 1869 a 1,340-foot circular tunnel was dug through the London clay using a cast iron shield, an idea that had been patented in 1864 by Peter W. Barlow but never built.
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