The Blockhaus d'Éperlecques, also known as the Watten bunker, is a Second World War German military bunker located near Saint-Omer in the Pas-de-Calais département of northern France. Constructed under Hitler's directive as part of the V-2 rocket program, it was designed as a hardened launch facility to attack England. The bunker is situated approximately 14.4 kilometers north-northwest of the more developed La Coupole V-2 facility, within a region dense with Nazi Germany's V-weapon projects, including V-1 and V-3 installations.
Architecturally, the structure is a massive "blockhaus"—a term for a large, reinforced concrete bunker typical of German Atlantic Wall fortifications. Its primary function was to house and protect the A-4/V-2 rocket launching infrastructure. While the Wikipedia entry and supporting sources detail its historical role as a launch site, specific technical specifications such as exact wall thickness or armament are not provided in the available search results. The preparation for these V-2 launching bunkers began in late 1942, aligning its construction with the peak of Germany's western fortification efforts.
Today, the Blockhaus d'Éperlecques operates as a museum, preserving this significant piece of military history. It stands as a testament to the technological ambition and brutal engineering of the Nazi war machine. The site is part of the broader historical landscape of northern France's World War II fortifications, offering visitors a concrete glimpse into the Atlantic Wall and the race for advanced weaponry. Its current state is maintained for public education and urbex (urban exploration) heritage, though the search results do not detail its exact preservation condition beyond its museum status.