Updated 14th January 2018

   The 1200mm culvert outlet is found on the north side of the motorway at 30T 0442404 4804481, altitude about 39m. A crawl into the tube passes under the motorway to a rock face with water welling up from it's base, a 50/75mm wide rift which could be peered along for at least 3m, and a roof that appeared to be shuttering ply. It is presumed there is a concrete slab above.

References: anon., 2016d (autumn logbook)
Entrance pictures : November 2016
Underground pictures : November 2016
Video :
Detailed survey :
Line Survey :
On area survey :
Survex file :