So there a a lot of parts to the museum and you have to pay separately for different parts, which can get kind of complicated. If you are planning to go, find out in advance what you want to see. We went to see the regular exposition, the sub and the Cite des Enfants 2-7. Apparently there are also playgrounds outside, but those weren't immediately obvious to us and in the end we had to move one.
The regular exposition is really nothing special. On the second floor there is an optical illusion/interactive part which is quite fun to do though.
At the Cite de Enfants our kids (2,4 and 6) had a blast. Basically you get 1,5 hour to play around with all kinds of interactive stuff, which also teaches your kids something. In the end 1,5 hour was just too short.
After that we visited the sub. It was pretty interesting for aduls, not so much for my oldest daughter. Basically you get to walk through the sub from back to front with an audioguide. There is also a small exhibition.
One thing to avoid is the canteen on the ground floor. It's horrible and expensive. We parked in the garage of the museum and couldn't find our car. It's not very clearly marked and we forgot to take note on which floor (there are two) we parked and where we parked.
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