On a low hill just East of Three Cliffs Bay Caravan Park (North Hills Farm).
SEALED All surface features remain intact but the ventilation louvres are missing and the BPI is bent over flat. Two stone slabs have been concreted onto the top of the access shaft to prevent access. There is a strange breeze block extension to the back of the ventilation shaft, it is unclear if this is original. Prior to sealing the post was used as a cesspit with all the waste from the caravan park being dumped in it before their new toilet block was built. The owner is planning to put an interpretation board on the post.
Opened in 1966 and closed in 1968.