The hidden side of a historic West Yorkshire canal lock has been revealed to the world after it underwent a truly draining experience.
And this Sunday Thornes Lock in Wakefield, on the Calder and Hebble Navigation, will be offering up some of its watery secrets to visitors.
They are being given the chance to walk along the bottom of the lock – which is 22m long, nearly 6m wide and 5.6m deep.
The rare opportunity has arisen because both sets of lock gates – which are almost 30 years old and weigh up to four tonnes each – have been lifted out in order to be replaced.
The Canal & River Trust is carrying out the £100,000 vital repairs project.
The open day will be held between 9.30am and 3.30pm.