Construction of the biggest waste water tunnel to be built in Scotland has reached the half-way stage.
The £100m Shieldhall Tunnel is being built by Scottish Water to improve water quality in the River Clyde and to tackle flooding.
When finished, the tunnel will be just over three miles (4.8km) long - five times longer than the Clyde Tunnel.
The 1,000 tonne drill being used to make the tunnel has just reached a point under Pollok Park.
On Monday, engineers installed a set of the giant concrete rings that form the tunnel about 32ft (10m) under the east of Pollok Park at a point that is 1.55 miles (2.5km) along the route.
They expect to have completed the project later this year.
Paul Kerr, from Scottish Water, said: "We are delighted to have reached this milestone half-way stage in the tunnel construction.
"The Shieldhall Tunnel team includes some of the best and most experienced tunnellers in the world and they are making great progress with what is the biggest project of its type Scottish Water has ever undertaken."
Shieldhall Tunnel so far
- More than 1,600 concrete rings completed
- More than 150,000 tonnes of earth, stone, clay and other material excavated
- More than 1,000,000 hours of work completed
- First half of the tunnel would be able to store the equivalent of 18 Olympic-sized swimming pools