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https://twitter.com/NorthHertsSam/status/1586436018886283264
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https://twitter.com/NorthHertsSam/status/1496947339537575936The tunnel was first built as part of the Royal Aeronautical Establishment facility at Thurleigh Airfield near Bedford, England. Construction on the Twinwoods Farm site started in 1947, and its aim was to advance British military aviation technology.
https://twitter.com/DoubleDashMM/status/1418126189345058816