A £750,000 project to repair one of the Lake District's water pipelines has started.
The pipeline pumps water from the Lake District to Manchester
The 100-mile long Thirlmere Aqueduct, which carries water from Cumbria to the Manchester area, was built in 1885.
Engineers are re-lining three of the bridge sections with a special waterproof plastic.
At the same time an inspection team will go through some of the tunnel sections checking where work needs to be done in the future.
Due to the remote location of the stretch between Thirlmere and Kendal, workers and their equipment will be transported by helicopter.
The aqueduct will be out of service while the work is carried out, so supplies for Manchester will be pumped down from Haweswater and Windermere.