Looking like a cross between a scene from Alien and the world's scariest subterranean roller-coaster, this was one of theClyde Tunnelsbefore the road deck and lining went in.
Under each road deck is the pedestrian/cycletunneland ventilation ducts.
TheClydeTunnelis actually two parallel tunnels. Works started in 1957 and the tunnels cost £10.5m; with the builders using atunnelshield based on the design that Marc Isambard Brunel used to burrow beneath the River Thames a century earlier.
With the tunnel workings pressurised, to stop the weight of earth and water above from caving them in, many workers got the bends - just like deep-sea divers. This was also down to some workers refusing to to go through the decompression sequence given the length of time required (around an hour) – as they came back to the surface. Two men died of the condition
The firsttunnelwas opened by the Queen in 1963, and the second opened the following year.
At the time it was the steepest roadtunnelever built, with a maximum gradient of 1:16 (6%). Today it carries around 25 million vehicles a year.
Now, let's see if you can hold your breath all the way through...
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