Work on a scheme to remove overhead pylons in the Yorkshire Dales and place cables underground has led to a notable archaeological find.
The work near Malham led to the discovery of dozens of prehistoric flint tools, which has led to work stopping while archaeology students from Bradford University carry out investigations.
Mark Newman, the National Trust’s consultant archaeologist, remarked that the area around Malham Tarn was prime "summer hunting ground" in the Stone Age because of its good grazing land and large wildfowl population.
Discussing the benefits of the 'undergrounding' project for those who like to go walking
and mountain biking there, the national park's policy and planning officer Tom Harland said: "There are a number of undergrounding projects on the go at the moment.
"The main aim of the scheme is to reduce the visual impact that electricity lines have on the landscape."
Formally commenting on National Grid proposals in 2011 to place more overhead lines underground, the English National Park Authorities Association said all overhead lines should be kept out of national parks or placed underground whenever possible.