Just kidding. No diving advised. It's actually brine, imported from Lostock in Northwich via pipelines established in the 1880s and stored in the Weston Brine Reservoirs on the site of the old quarries, to be channelled down to Weston point where it's used in the production of caustic soda and chlorine. The site resembles much of weston point in that it's functional but almost entirely void of aesthetic maintenance. A trademark of most relics that exist from the ICI era.