Fake air vent built into a bunker in Normandy.
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Previously:
WWI fake iron trees used as observation posts - photos
WWII Churchill tank converted into mine clearer
WWII German rescue buoy - photos
WWII bailing out of aircraft training - GIF
WWII drop tank car - photo
WWII use of war dogs short film - video
video of WWII German military helmets repurposed into colanders

