The WW2 Grampound Auxiliary Unit Operational Base was a secret underground bunker used by the British Auxiliary Units, a clandestine resistance organization formed during World War II. These units were trained to conduct sabotage and guerrilla warfare operations in the event of a German invasion of Britain. The base near Grampound, Cornwall, would have served as a hidden operational center for local Auxiliary Unit members, providing shelter and storage for weapons and supplies.
The exact location and structure of the base remain largely unknown today, as many such sites were deliberately concealed or destroyed after the war.