Around the old quarry in Les Vardes, the German Navy built a gun battery with four 150 mm guns in 1941. The guns were installed in open concrete ring positions and a large ammunition bunker (M145), several crew bunkers (M151), Air defense bunkers (FL242) and a large command bunker (M132) were installed to control the fire from the guns.
On the edge of the quarry a bunker called "Marine Peilstand und Meßstellung 1" was built in 1942.
The MP1 bunker should be part of a network consisting of a total of six bunkers all around Guernsey.
This network should observe enemy ships and using observations from just two of the bunkers, direction and distance could be accurately and quickly calculated. This information could then be passed to the guns in the various battery on the island.
The large bunker collapsed into the quarry in 1991.
The Germans continued the extraction in the gravel pit and began the construction of a large stone crusher. The stone cluster itself disappeared at the bottom of the English Channel, as the boat that shipped it to Guernsey was lowered.
To transport the broken rocks to the construction sites on the entire island, the Germans established a narrow-track railway with tipper trucks.
Most of the bunkers are today absorbed by the quarry, but some are preserved and the foundation of the big stone crusher is also steadily in the area.