Écluse Fortifiée, Fortified lock in Saint-Nazaire, France
The Écluse Fortifiée is a fortified lock in Saint-Nazaire, facing the former repair bays of the German submarine base. The structure is made of solid concrete, with a wide passage for submarines, firing openings along its walls, and small bunkers with gun positions on its roof.
The lock was built in 1943 by the German occupying forces, after British raids on the submarine base showed the need for better protection. It was completed in 1944 but is believed to have never been actively used by the German troops.
The roof of the fortified lock offers an open view over the entire submarine base. Standing there gives a clear sense of the scale of the site and how its different parts relate to each other.
The site is located next to the submarine base and easy to reach on foot. The roof is accessible by elevator for those who cannot use stairs, though the site has some open areas and steps that require caution, especially with young children.
Although the lock was completed in 1944, there is no evidence it was ever put to military use. It was built in anticipation of continued attacks and stood unused until the end of the war.
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