The bunker is a schwere mg Rinständ or Tobruk bunker for a heavy machine gun. On the edge of the bunker turned a gun mount on which a mg 311 (f) was mounted. The North Sea beach could be monitored and fired upon from the bunker. In the ring around the bunker is a special field of fire marketing. The names Anton, Bertha, Cäsar and Dora come from the German spelling or telephone alphabet. In Dutch the names would be Anna, Bernard, Cornelis and Dirk. The names correspond to the sectors from which the soldiers could expect an attack. Today, Defense still uses a similar system.