These 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 bunkers were built between 1915 and 1918. There were several different types. The shelters were built on parts of the New Dutch Water Line that could not be inundated.
Some group shelters are equipped with a loophole so that they could also be used as casemate for a machinegun.
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