A military bunker located near Den Hoorn, Netherlands, on the Dutch coast. This structure is part of a network of underground bunkers and tunnels built by Nazi forces during the Second World War as part of their Atlantic Wall defensive fortifications. The Dutch coast was heavily fortified during the German occupation, with numerous concrete bunkers constructed to defend against potential Allied invasion.
These fortifications formed what has been described as a 'lost city' of military installations along the coastline.