The Dutch group shelters were designed as a shelter by shelling and bombing, if the trenches between the shelters did not give enough coverage. The principle was based on the fights in the First World War. The bunkers were part of the Stronghold Holland.
Several dozens of group shelters (type 1 of part II of the VIS) were built between February and May 1940. Because they had to be build fast, the bunkers are a bit smaller than those in the New Dutch Water Line.
These personnel bunkers were called 'Pyramids' by the Germans, because of their shape.
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