2008 06 tale of a tunnel geoff ballinger, bbc wales
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TALE OF A TUNNEL
GEOFF BALLINGER
First Severn Tunnel Act 1810
Three Pence an Ass…
TUNNEL TOTALSLength:4 miles 624 yards
14 years to build
76 million bricks
37,000 tons cement
23 million gallons of water pumped daily
50 feet min between top of tunnel and bottom of river
20 minutes until water reaches track level (in case of failure)
Where the Great Spring goes…
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