Fake air vent built into a bunker in Normandy.




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