They are planning to dig a 10 km tunnel starting at Sellafield at a starting depth of around 300 m and below the surface of Ennerdale water at 1000 m.
Although other locations have been put up for consideration the Ennerdale valley is rumored to be a favorite. If Ennerdale (or any others) are chosen then intrusive drilling and surveying to check the area is seismically safe will have to happen before the tunnel is started.
Also, because of the valley's remoteness many local roads would have to be widened to allow industrial traffic into the valley a road way from Gillerthwaite to the top of Ennerdale Fell may also be built which would have to also be built on Iron Crag. This would lead to permanent scarring of Ennerdale Fell and Iron Crag and would have a large impact on the whole surrounding area too. A huge (about the same size as Carlisle) underground facility would also have to be built under Iron Crag and a surface facility would be built at the head of Ennerdale water, near Gillerthwaite. This could lead to pollution of Ennerdale water. All of which could threaten this area of Cumbria's inclusion in the Lake District National Park.
To stop this the BMC have set up a petition to help prevent nuclear waste being dumped in the lakes. Help them get to the needed total!