The Dutch group shelters, part of the New Dutch Water Line, 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 group shelters were built in 1939 and 1940. A number of these were not completed yet with the outbreak of the Second World War. The build of these were not finished.
These personnel bunkers were called 'Pyramids' by the Germans, because of their shape.
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