A military structure identified by the designation 'OB 7,5cm Flak' located near Calais in northern France. The coordinates place it in the Pas-de-Calais region, an area of significant military fortification during the Second World War as part of the Atlantic Wall defenses. The designation suggests a possible German-era anti-aircraft (Flak) bunker, though this specific site is not detailed in the provided historical sources.
The web search results focus exclusively on France's post-war nuclear weapons program and do not contain information confirming the identity, history, or purpose of this particular structure. Its current condition and exact historical role remain unverified by the available data.