Churchill's Secret Army - Auxiliary Units in WW2 - WW2TV plus a link to Atlas Obscura

There Are Hundreds of Secret Underground WWII Bases Hidden in British Forests

Built to fight a Nazi invasion, they remained unknown for decades.

It’s almost impossible to find one of Britain’s secret, underground military bases unless you know what to look for. In the years since they were built, starting in 1940, many of them have collapsed or fallen into disrepair. While the bunkers are no longer camouflaged today, they still guard their secrets. To the untrained eye, their entrances might look like random holes in the ground.

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Wikipedia article on the Auxiliary Units: Auxiliary Units

One of the definitive websites about the Auxiliary Units a.k.a. Stay Behinds: https://www.staybehinds.com/

The Memories of Major RF "Henry" Hall on the BBC Forums: Auxiliary Units by Major R F "Henry" Hall

Is it time for us to start getting ready for our own "Stay Behinds"?