Dutch group bunker type 1 (with 1 entrance), part of the Stelling van Amsterdam (Defense Line of Amsterdam, a Unesco World Heritage Site), specifically called the Positie bij Spaardam (the Postion of Spaarndam). The bunker was designed as a shelter against shelling and bombing, if the dike and the trench (along which the bunker is located) offered insufficient coverage. T
It is one of the many bunkers that were built during World War I between Fort benoorden Spaarndam and Fort bezuiden Spaarndam. There were several types, including type 1 (1 entrance) and type 2 (double entrance).
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