filter of a gas mask of the second world war that is an object of militaria found among the roots under the ground

antique apparatus archeology army bunker chemical danger decay detector dig digg digger equipment filter forest found gas ground history hunt hunter land mask metal militaria military nature numismatist object pirelli protection protective rare relics respirator retro root roots rusted scary second soil soldier t35 terror that treasure vintage war weapon woods world ww2 wwii