On the former Catfoss Airfield, 75 yards South of an old concrete taxi way.
LOCKED The mound has been completely removed with the top of the monitoring room visible flush with the ground leaving the two shafts and the FSM pipe standing on 3 feet of concrete. The BPI pipe has gone. The whole structure including the parts that were originally below ground are now painted with camouflage paint. The hatch is locked using its original bar. Presumably the room below is used for some purpose as the FSM pipe is wrapped in plastic with a plastic bucket on top to stop water getting in. All the ventilation louvres are still in place.
Opened in 1962 and closed in 1968.