Marineküstenstation Marienleuchte

Marineküstenstation Marienleuchte is a German naval monitoring facility on Fehmarn Island at the narrowest point of the Fehmarnbelt strait in the Baltic Sea. The site includes multiple service buildings, residential quarters, and specialized underground installations for tracking shipping and radio communications.

Operations began in 1908 as a naval observation post of the Imperial German Navy at a strategically important location on the Baltic. During the Cold War, the facility expanded significantly to monitor Soviet and East German naval movements and radio transmissions.

The name comes from Queen Marie Sophie, who was also the namesake of a lighthouse built by Danish naval authorities in 1832. This connection to the lighthouse remains visible in the site's character and its role in Baltic coastal history.

The site is positioned on exposed coastal terrain and can be reached from the nearby town, though access routes and viewing areas may vary depending on current regulations. Visitors should prepare for changeable weather, as the exposed location at the strait and open coast often brings strong winds.

The basement of the service building held equipment for intercepting Soviet and East German military radio and radar signals until 1990. This eavesdropping activity was a significant part of West German monitoring of Soviet presence in the Baltic during the division of Germany.