To the next century
Tunnel supply and logistical support was by crane
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Stop logs removed and diversion blocks placed to divert flow into new tunnel -
The three tunnel sites, Nantmel, Bleddfa and Frydd Wood shown within Great... -
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Tunnel completed -
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Bleddfa connection. Existing wall broken out. Flow contained behind double... -
Segments were trapezoidal and 1.2m-long and 190mm thick, six making up a ring -
TBM thrust rams pushing against the most recent ring -
Ken MacGregor, project director (left), Tom Hastings, tunnel agent (centre)... -
View from the man lift looking down the launch shaft -
Tunnel supply and logistical support was by crane