# Bunker Valentin (DD-571)

> Bunker Valentin is a bomb-proof U-boat factory that the German navy (Kriegsmarine) built on the Weser River at Bremen-Farge, in Bremen's Rekum district. With Allied bombers pounding open shipyards, the plan was to assemble Type XXI submarines there from prefabricated sections, on an assembly line. Construction ran from 1943 to March 1945. The memorial says it was the second-largest above-ground bunker in Europe. Wikipedia gives its size as about 426 m long and up to 97 m wide, with a height of 22.5 to 27 m. Its walls are about 4.5 m thick, and its roof is 4.5 m thick, rising to 7 m in one section. According to the memorial, up to 10,000 forced laborers built it: civilians from across Europe, Soviet prisoners of war, Italian military internees, concentration-camp prisoners from the nearby Neuengamme subcamp at Farge, and Gestapo labor-camp inmates. They worked 12-hour shifts day and night. The memorial puts the death toll at about 1,600, from hunger, disease and arbitrary killings, and 1,144 victims are known by name. On March 27, 1945, RAF 617 Squadron bombed the bunker with Grand Slam and Tallboy bombs. Two Grand Slams broke through the thinner western roof. Building stopped soon afterwards, and no submarine was ever finished there. After the war it was used for bomb tests. From the 1960s to 2010, the German navy (Bundesmarine) used it as a depot. A memorial sculpture, 'Vernichtung durch Arbeit' ('Extermination through Labour'), was erected in 1983. The bunker opened as the Denkort Bunker Valentin memorial on November 8, 2015. The footage shows the overgrown exterior walls and the dim interior bays behind fencing.

- Department: History (also Military, Locations)
- First published: 2025-05-15
- Last updated: 2025-05-15
- Permalink: https://detailenjoyer.com/case/bunker-valentin/
- Author: Marcus Easterling (DetailEnjoyer), The Detail Department

## On the timeline

- **1943**: The German navy begins building the bunker at Bremen-Farge
- **March 27, 1945**: RAF 617 Squadron's Grand Slam bombs break through part of the roof
- **1983**: The memorial sculpture 'Vernichtung durch Arbeit' is erected
- **2010**: The German navy's use of the bunker ends
- **Nov. 8, 2015**: The Denkort Bunker Valentin memorial officially opens

Full timeline: https://detailenjoyer.com/timeline/?case=bunker-valentin

## Quick facts

- **DD-571-F01**: Up to 10,000 forced laborers built Bunker Valentin. _(Write-up · Exhibit B (Forced labor))_
- **DD-571-F02**: No submarine was ever built in Bunker Valentin. _(Write-up · Exhibit D (Never finished))_

## Write-up

Built by forced labor, never used. No U-boat was ever completed inside Bremen's Bunker Valentin.

1. **Assembly line in concrete**: Type XXI U-boats were to be assembled in sections, safe from Allied bombing.
2. **Forced labor**: Up to 10,000 forced laborers from across Europe built it in 12-hour shifts.
3. **About 1,600 dead**: The memorial estimates about 1,600 deaths, and 1,144 victims are known by name.
4. **Never finished**: RAF Grand Slam bombs broke through the roof in March 1945, and no submarine was built.
5. **A memorial**: After decades as a navy depot, it opened as a memorial on November 8, 2015.

## Related case files

- [Ballistic Trident (DD-627)](https://detailenjoyer.com/case/ballistic-trident/): Another submarine case
- [Bethlehem Steel (DD-010)](https://detailenjoyer.com/case/bethlehem-steel/): Another case about wartime industry
- [King Tiger (DD-146)](https://detailenjoyer.com/case/king-tiger/): I linked another WWII German project

## Reel vs. record

- **Note**: 'Using forced labor from concentration camps and prisoners of war': these groups and more. The memorial lists civilian forced laborers from Eastern and Western Europe, Soviet POWs, Italian military internees, concentration-camp prisoners and Gestapo labor-camp inmates, up to 10,000 in all. About 1,600 died.
- **Note**: '33 m high': Wikipedia gives a height of 22.5 to 27 m. The 426 m length and 97 m maximum width match.
- **Note**: 'Concrete walls and ceilings up to 7 m thick': the walls are about 4.5 m. The roof is mostly 4.5 m, and only one section reaches 7 m.
- **Note**: 'Intended to produce U-boats in secret': it was a high-priority project but no secret to the Allies. RAF 617 Squadron bombed it on March 27, 1945, and two Grand Slam bombs broke through the thinner western roof.
- **Missing**: the bunker was never finished and no submarine was built there. It was a German navy depot until 2010, and the Denkort Bunker Valentin memorial opened on November 8, 2015.

## Video: Bunker Valentin: Built by Forced Labor, Never Used

- Duration: 23.2 s · Published: 2025-05-15
- File: https://detailenjoyer.com/assets/videos/DJrUPn6RaR8.mp4

### Transcript

DID YOU KNOW? Bunker Valentin is a massive WWII-era submarine factory built by Nazi Germany near Bremen, intended to produce U-boats in secret. Constructed between 1943 and 1945 using forced labor from concentration camps and prisoners of war, the bunker measures around 426 m long, 97 m wide, and 33 m high, with concrete walls and ceilings up to 7 m thick to withstand Allied bombing. NOW YOU KNOW!

## Questions & answers

**Q: Which river does Bunker Valentin stand beside?**  
A: At Bremen-Farge. _(Source: Write-up · Exhibit A (Assembly line in concrete) · Denkort Bunker Valentin (English); Wikipedia: Valentin submarine pens)_

**Q: About how many forced laborers built the bunker?**  
A: According to the memorial. _(Source: Write-up · Exhibit A (Assembly line in concrete) · Denkort Bunker Valentin (English); Wikipedia: Valentin submarine pens)_

**Q: How many submarines were completed in the bunker?**  
A: Construction stopped after the March 1945 raid. _(Source: Write-up · Exhibit B (Forced labor) · Denkort Bunker Valentin (English))_

**Q: Which RAF squadron bombed the bunker in March 1945?**  
A: With Grand Slam and Tallboy bombs. _(Source: Write-up · Exhibit B (Forced labor) · Denkort Bunker Valentin (English))_

**Q: When did the Denkort Bunker Valentin memorial open?**  
A: On November 8, 2015. _(Source: Write-up · Exhibit A (Assembly line in concrete) · Denkort Bunker Valentin (English); Wikipedia: Valentin submarine pens)_

## Sources

- [Denkort Bunker Valentin (English)](https://www.denkort-bunker-valentin.de/sprachen/english)
- [Denkort Bunker Valentin: Opening ceremony, November 2015 (in German)](https://www.denkort-bunker-valentin.de/news/rueckblick-eroeffnungsveranstaltung)
- [Wikipedia: Valentin submarine pens](https://en.wikipedia.org/wiki/Valentin_submarine_pens)
- [Bremen.de: Denkort Bunker Valentin (in German)](https://www.bremen.de/kultur/museen-und-wissenswelten/denkort-bunker-valentin)

## Cite this case file

Easterling, Marcus. "Bunker Valentin." The Detail Department (DetailEnjoyer), case file DD-571, last updated May 15, 2025. https://detailenjoyer.com/case/bunker-valentin/