The bunker can be visited
Military ObjectBordeaux
Bordeaux submarine base
The Bordeaux U-Boat Base, with its seven dry docks and four wet docks, measures 245 x 162 meters and is 19 meters high. Construction of the bunker began in September 1941 and was completed by May 1943. From mid-1943, work began on reinforcing the ceilings, but this was not completed by August 28, 1944, the evacuation of the port.
Source: Wikipedia · Licence: CC BY-SA 4.0 · Image: http://en.wikipedia.org/wiki/File:Basesousmarine.JPG
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 44.8698, -0.5586