Fortress · Germany · Partial ruin
Valentin submarine pens
U-Boot-Bunker Valentin
The Valentin submarine factory is a massive reinforced‑concrete U‑boat assembly bunker built on the Weser near Bremen by Organisation Todt between 1943 and March 1945. Intended for final assembly of Type XXI submarines in 13 longitudinal bays, it reached about 90–95% completion but was bombed before full production began. Built with forced labour, the structure later saw post‑war testing and partial reuse; parts of the building are now a memorial and visitor centre.
First raised
1943
Its prime
1945
Today
Partial ruin
As it stood in 1945
What Valentin submarine pens looked like in its prime.
A monumental rectangular block of raw grey reinforced concrete, roughly 420 metres long and up to ~100 metres wide, with sheer vertical outer walls 20–30 m high. The roof is a tiled sequence of large pre‑cast concrete arches filled to form a multi‑metre‑thick slab, punctuated by a few raised box‑like roof structures. At the western end a broad, watertight gateway opens to a short canal onto the Weser. The scale is monolithic and factory‑like, with few exterior openings and heavy service quays at the river edge.
Step inside
10 places to explore in 1945.
The record describes 10 distinct spots at Valentin submarine pens, including 5 interiors: longitudinal view along the line of takt assembly bays, interior beneath the raised roof boxes (takt 9 and 10), high walls and watertight separation between takt 12 and 13 and more. Create your own photoreal reconstruction and explore every one, more scenes means more photos, more angles and more of the immersive experience.
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