It will not be possible to reopen the Norwood Tunnel, as several sections have collapsed, the National Coal Board filled in some sections to stabilise the land above it, and when the M1 motorway was built, the tunnel below it was injection grouted, to ensure there would not be a subsequent collapse. The engineers Arup considered options for this section in 2007, proposing a route running largely on the surface, and crossing the site of the Kiveton Park Colliery, which closed in 1994. It involved an extra six locks at the top of the Norwood flight of 13 locks, passing under the motorway by using a farm underpass, and then descending through another six new locks, to enter the final of the tunnel. However, announcement of the revised route for the HS2 railway has resulted in other options being reconsidered. One is for a short tunnel at the western end, starting at the existing western portal, but heading in a different direction. The tunnel would be some long, passing under the route of HS2 and the M1 motorway, allowing HS2 to be constructed without interfering with navigation. The scheme would save the need to construct six locks, and engineers were assessing the cost of such a scheme in late 2017.