This German Vf ammunitions bunker of Stützpunkt 155 Tümmler along the Route-du-Cap near Audinghen was part of Marine Kusten Batterie (MKB) Grosser Kürfürst. This was a large coastal battery which had four 280 mm SK L/50 280/50 artillery guns that could hit targets on the British coast.
Visit
The bunker is closed and appears to be used by the farmer. A second ammunitions bunker is situated a little bit further East.