Valentin U-Boat Bunker

Bremen, DE

The Valentin submarine assembly plant in Bremen-Farge was one of the most ambitious construction projects of the Third Reich — an underground production facility designed to manufacture **U-boats of Type XXI** at a rate impossible in surface shipyards vulnerable to Allied bombing. Begun in March 1943 and never completed, the bunker is **426 metres long**, **97 metres wide**, and **27 metres high**, with reinforced concrete walls and roofs **4.5 to 7 metres thick**. Construction employed approximately **10,000 forced labourers** — primarily Soviet and French prisoners of war along with concentration camp inmates from the **Neuengamme** satellite camps — of whom an estimated **4,000 died** due to brutal working conditions, malnutrition, and Allied bombing. On **March 27, 1945**, the RAF conducted a precision raid using **Barnes Wallis Tallboy** penetrating bombs, causing severe structural damage and effectively halting production — one of the rare cases where bunker construction was stopped by aerial attack. The plant never produced a single operational submarine. Today the Valentin bunker is a **federal memorial site** (Gedenkstätte Valentin) and the primary monument to forced labour in submarine production.