A series of ten programmes
with Kenneth Hudson
The third of a new series looking at Britain's industrial heritage.

Under the shadow of Snowdon stands a gaunt stone fortress, but this building had no military purpose. It was, in fact, the head-quarters of the Dinorwic Slate Quarry. Here in this isolated valley was a totally self-contained industry which trained its own incredibly skilled men and maintained its own massive machines - the Welsh slate industry.