This large bunker is located deep underground. To reach it, visitors must descend a steep staircase. A chair lift has been built especially for disabled visitors. The bunker, a type Küver 431 Notstrom Bunker for 70 KVA, was equipped with an emergency power supply. It is a rare type; only two were ever built in the Netherlands, one on Terschelling and one on Schiermonnikoog.
The photo shows the entrance to the bunker, which was specially built to protect the stairs and chairlift.