Before going, make sure you make a reservation. Tours are in French, German, and English but you must reserved beforehand to ensure they provide a tour in your language. As others have mentioned, you watch a short film at the beginning talking about the reasons the Maginot Line was built, what happened in that area during the war, and the aftermath. Then you take a train tour in the tunnel followed by a guided tour showing you where the soldiers worked, ate, bathed, medical facilities, and so on. Overall, I think it lasted about 3 hours and it's very cold in there (10°C / 50°F). And go to the bathroom before you start the tour because there are no bathroom facilities down there.
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