Atlantic Wall in the Netherlands

V143-Mammutstand.

The typical number for this V143 Mammut radar bunker at Wijk aan Zee is 5656A.  

The bunker number 5656A is depicted above the defence site. 
Fresh air supply is shown at the right side, at the defence room.
Left: gallery in the mammut radar bunker.
Right: 
some remains of tubings.
Left:
looking to the compensator room. Notice the broad doors.
Right:
three sockels for generators.
Left and right cable supplies to the outside.

Moving impression in the bunker at the right cable system to the outside.