Scottish Water's flagship Shieldhall Tunnel project, in the south of Glasgow, is the biggest waste water tunnel ever to be built in Scotland.
The £100m tunnel, which enables Scottish Water to improve water quality in the River Clyde and reduce flooding issues at key locations, is, at 3.1 miles long, five times longer than the Clyde Tunnel.
The tunnel was constructed using a specially designed, 1000 tonne, 180-metre-long, tunnel boring machine, and at 4.7 metres in diameter is big enough to fit a double decker bus inside
Tunnelling started in July 2016 and was completed in early spring 2018. The project was formally completed and operational in July 2018.
The tunnel route was carefully selected to minimise disruption, and runs from Craigton Industrial Estate, under the Glasgow Paisley Canal railway line and the M77, under Bellahouston Park, Pollok Park, along Titwood Road to Queen's Park where a newly-installed flume connects the tunnel to the existing sewer network.
Further detail on the Shieldhall Strategic Tunnel, and associated ancillary projects, is available on the Scottish Water website here.