In 2012, Balfour Beatty fitted new electricity cables through the tunnel which were individually laid in concrete and sand insulated ducts at the tunnel exit for connection to the first pylon. Old galvanised steelwork over the River Etherow was removed. The tunnel has a flat concrete floor and concrete-finished walls and ceiling. The cables run down both sides of the tunnel attached to metal framework. Six cables run along each wall, each about in diameter with thick insulation and other ducting and cables run along the floor. At the western end, the old concrete and tarmac platforms still stand.