Seat Naze Underground Reservoir

Seat Naze underground reservoir in Lancashire was constructed sometime in the 1800's. Carved out of solid rock construction would have been a slow and painful task that would have involved some amount of knowledge of stone mining. The only access to the reservoir is by crawling on hands and knees through a 3ft adit that seems to go on for longer than it actually does. Around 2/3 of the way in the adit becomes taller and widens out a bit before reaching 2 8ft walls around 4 ft apart with the void between filled with concrete, the wall was constructed this way to ensure it was strong enough to cope with the pressure from the water on the other side. The last 3 pics below show the inside of the reservoir when I visited it a couple of years ago when it had been drained for maintanence, these shots are low quality images but as it has since been filled back up it is impossible to get any more pics of the reservoir floor.