A quick cache and dash to a Cold War relic just off the A30 as
you leave Chard heading West.
This Cold War nuclear monitoring post finally closed in September
1991 after a number of years' service (its construction date is
unknown).
The Orlit (type B) post is in good condition and the GZI (Ground
Zero Indicator) is still in place. The GZI consisted basically of a
pinhole camera with four holes facing the cardinal compass points.
A piece of photographic paper was placed in-front of each hole and
in the event of a nuclear burst, the image of the fireball would be
projected through one or more of the pin holes. From these, the
bearings and elevation of the burst could be calculated.
The underground monitoring post can still be accessed (you take
all responsibility for the risks involved). However, it has
suffered from fire damage and a lot of water has entered through
the open hatch.
You do not have to enter either the Orlit post or the
underground monitoring room to retrieve the cache.
More information and pictures can be found
here.
There is parking for one or two cars alongside the cache.