A military structure designated WN 418 located near the commune of Saint-Martin-de-Varreville in the Manche department of Normandy, France. The coordinates place it within the historical region of the D-Day landing beaches. The designation 'WN' (Widerstandsnest) is characteristic of German fortification terminology from the Second World War, suggesting a potential connection to the Atlantic Wall defenses constructed by Nazi Germany in occupied France between 1942 and 1944.
However, the provided web search results contain no specific information confirming the existence, type, function, or historical details of this particular site. The search results exclusively discuss modern French nuclear weapons policy and deterrence strategy, which are unrelated to this specific location and its likely WWII context. Without corroborating historical records or archaeological surveys referenced in the search, the precise nature, construction date, and operational history of this structure remain unconfirmed.