VOLUNTEERS plotted the fallout of nuclear bombs at the Royal Observer Corps in Oxford.
The team at the Woodstock Road site charted information about the fallout of a potential nuclear attack as part of a monthly exercise in August 1962.
Continuous telephone contact was maintained with 38 posts at 10-mile intervals over an area covering the whole of Oxfordshire and five other counties.
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Each post, manned by three volunteer members of the corps, was buried 13ft underground to protect from the fallout.
At 7.59pm, the first bomb drop was reported, with vital information on its impact collected just seven minutes later.