U-Boot Base Saint-Nazaire

Saint-Nazaire, FR

The submarine base at Saint-Nazaire was one of the most strategically vital installations of the Atlantic Wall, housing the **7th U-Boat Flotilla** from 1941 onwards. Constructed between 1941 and 1942 by Organisation Todt using an estimated **480,000 cubic metres of concrete**, the bunker consists of 14 pens capable of sheltering submarines weighing up to 1,700 tonnes, with roof thickness reaching **8 metres** of solid reinforced concrete. Saint-Nazaire is also famous as the site of **Operation Chariot** on March 28, 1942, when British commandos and the destroyer HMS Campbeltown, filled with delayed-action explosives, rammed the dry dock gates of the **Forme Écluse Louis Joubert** — the only dock on the Atlantic coast capable of servicing the battleship **Tirpitz**. The explosion destroyed the dock and denied the Kriegsmarine its use for the remainder of the war. The submarine bunker itself was never seriously damaged and survives in excellent condition today, serving as a cultural venue and museum. The adjacent **Écomusée de Saint-Nazaire** documents the Occupation and the Allied raids.