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Watch British Transport Films Collection online: Episode 8 Under the River

The dramatic story of the outstanding engineering feat of Thomas Andrew Walker in the the last century which enabled the building of the famous Severn Tunnel - the longest underwater tunnel in the world to be completed at this time. The film is in particular a tribute in sight and sound of the unique group of six magnificent Cornish beam engines which kept the tunnel free of water for over seventy years before being replaced by electric pumps.

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