A narrow staircase led to an opening in the riverside wall of Hailes Castle to provide access to a well. There is a possibility that there would also have been access to the river Tyne below.
This is one of the more unusual features of Carisbrooke Castle on the Isle of Wight. This comes from a British Pathe news bulletin of 1963. The castle was placed under state guardianship and is now part of English Heritage.
The well was dug after 1136, and is some 49 m deep. The first recorded mention of the use of donkeys to turn the wheel dates to 1696.
A more recent video from the BBC shows the revised conditions in 2011, although some of the older Ministry signage can still be spotted.