A machine called "Clare" is at the centre of a �38m project to improve domestic water supplies in Lancashire. Up to 600,000 people are expected to benefit from the initiative, which started on Monday.
United Utilities (UU) is using Clare - a 50-tonne tunnelling machine - to enable it to construct a network of new pipes.
The scheme is expected to last two years and is part of a �3bn investment in the North West by the company.
Residents living in the Ribble Valley, Preston and the Fylde coast will benefit from the work.