Stp 155 Tümmler is a former German military bunker located near Wimereux, in the Pas-de-Calais department of northern France. Built during World War II as part of the Atlantic Wall defensive system, this concrete fortification was designed to house coastal artillery and support German naval operations along the English Channel. The site formed part of a network of bunkers and gun emplacements intended to repel Allied invasion attempts.
Today, the structure stands as a remnant of the region's wartime military heritage, attracting interest from history enthusiasts and urban explorers studying the Atlantic Wall fortifications.