Four 380mm Siegfried K Naval-type guns were mounted at Batterie Todt, which was inaugurated in February 1942.
The 64ft 5inch barrel weighed just over 103 tonnes and could fire a 1091lbs shell 34.6 miles or a 1764lbs shell 33 miles, both of which are in range of Dover across the Channel. The lighter shell took 33 seconds to cross the channel, the heavier took an additional 9 seconds.
In 34 miles the accuracy range was believed to be about 667 yards in depth and 71 yards in width.
Turm I has now been converted into a museum, Turm II can only be viewed from a platform on the outside. Turm III was blown up by two french road workers, who explored it shortly after its capture using sticks of cordite for light, and subsequently ignited the german cartridge store blowing the entire casemate apart. Finally, Turm IIII was used for a film in the 1960's which makes it hard to differentiate the original graffiti with that added for the film. The emplacement is still open to explore however this has led to a lot of graffiti and spoilage.