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BNPS.co.uk (01202 558833)
Pic: Bonhams/BNPS<br />
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The state in which the polling boards were found after the eruption of the river - 1827.<br />
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Fascinating plans for the world's first underwater tunnel from the Brunel family archive have come to light and are tipped to sell for £100,000.<br />
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The 1,300ft long Thames Tunnel connecting Rotherhithe and Wapping was such an amazing engineering feat it was described as 'the eighth wonder of the world'.<br />
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It was designed by Marc Brunel, the father of Isambard Kingdom Brunel who was also involved in the project.<br />
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Work on the tunnel, which was 35ft wide, 20ft high and 75ft below the river surface, got underway in 1825, but a combination of unfortunate accidents and spiralling costs meant it took 18 years to build.