Back U-Boot-Bunker St. Nazaire German Submarŝipa bazo de Saint-Nazaire Esperanto Base de submarinos de Saint-Nazaire Spanish Base sous-marine de Saint-Nazaire French Base sommergibili di Saint-Nazaire Italian База субмарин в Сен-Назере Russian
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| Saint-Nazaire submarine base | |
|---|---|
| Saint-Nazaire in France | |
 Saint-Nazaire submarine base, April 1942 | |
  Saint-Nazaire submarine base  Saint-Nazaire submarine base | |
| Coordinates | 47°16′30″N 2°12′9″W / 47.27500°N 2.20250°W |
| Type | Submarine pen |
| Site information | |
| Owner |  Nazi Germany |
| Operator |  Kriegsmarine |
| Site history | |
| Built | February 1941– June 1941 |
| Built by | Organisation Todt |
| In use | June 1941– May 1945 |
| Materials | Reinforced concrete, steel |
| Fate | museum |
| Garrison information | |
| Garrison | 6th U-boat Flotilla 7th U-boat Flotilla |
| Escal'Atlantic | |
The submarine base of Saint-Nazaire is one of five large fortified U-boat pens built by Germany during the Second World War in occupied Saint-Nazaire, France.