A 3.4km tunnel beneath Wales’ Dwyryd Estuary is done, ready for hidden 400kV cables to protect Eryri National Park 🌿 #UK #NationalGrid #EryriVisualImpactProvision

https://bigupbritain.co.uk/2026/10/16/3-4km-tunnel-breakthrough-clears-way-for-hidden-power-cables-beneath-eryri/