Near the WW2 beach you can visit this:
Cherbourg, there is the Redoutable SSBN to visit:
http://www.cite-de-la-mer.com/uk/emb...le/default.asp
St nazaire base with the only afloat submarine museum in france:
http://www.saint-nazaire-tourisme.co...n=777&idn3=218
Lorient -Keroman III (submarine base bunker)
http://www.lorient-tourisme.fr/Base_..._d.4189.0.html
At Brest you can't viist the submarine base, it is in a military aera.