The Blockhaus d'Éperlecques (English: Bunker of Éperlecques, also referred to as "the Watten bunker" or simply "Watten") is a Second World War bunker, now part of a museum, near Saint-Omer in the northern Pas-de-Calais département of France, and only some 14.4 kilometers (8.9 miles) north-northwest from the more developed La Coupole V-2 launch facility, in the same general area. The bunker is preserved as part of a privately owned museum that presents the history of the site and the German V-weapons programme. It has been protected by the French state as a monument historique since 1986.