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The mysterious medieval tunnel found by accident

A mysterious medieval tunnel system has been discovered by electrical technicians in south Wales.

A team working for Western Power Distribution made the discovery while moving an electrical pole near Tintern, in the Wye Valley, Monmouthshire.

Western Power said the tunnels, near to 12th Century Tintern Abbey, were not shown on any Ordnance Survey map.

After consultation with Cadw, the historic monument body for Wales, the energy firm has stopped all work to allow archaeological investigation.