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Subterranea Britannica is a society devoted to the study and investigation of man-made (including Nuclear Bunkers) and man-used underground places.. nuclear bunker, nuclear, bunker, RSG, UKWMO, Royal Observer Corps, ROC, subterranea, subterranean, britannica, brittanica, underground, adit, air raid shelter, ammunition store, tunnel, catacomb, cellar, chalk well, chalk mine, channel tunnel, coal mine, communications centre, conduit, control centre, crypt, drain, denehole, drift mine, dungeon, earth house, flint mine, fogous, fortification, fullers earth mine, funicular railway tunnel, grotto, ice house, cave, mine, military works, countermine, mushroom growing, ossuary, oubliette, pedestrian tunnel, pipe subway, priest hole, railway tunnel, refuge, reservoir, silo, slate mine, souterrain, stone quarry, subway, tunnel, quarry, railway, well.
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