The cost of the tickets (billets) varies as there are several attractions at the same venue including the museum K3 Pen and the sailing museum. You can either buy a ticket to Pass Nautisme and Pass Mixte With the Pass Nautisme and the Pass Mixte, combine several visits in your day out and save money: 2 visits = 10%, 3 visite = 15% discount. The opening hours depends on when you plan to visit but generally in summer it is open from 10 am till either 6 pm or 7 pm and the ticket office closes around 5 pm. The only way to get into the actual pens is by a guided tour which are conducted in the afternoon. I suggest that if you don’t have a car that you catch a taxi to the base as it is a little way out of the city and public transport is a bit confusing.

If you are wanting to get down into the pens themselves, we weren’t able to do so without a guide and the tours take place in the afternoon. They may have more tours during Summer but we were there they day before they were due to close for January. Otherwise you can walk through a submarine without a guide and the pens are such that they can be viewed from above. I hope this helps. BTW they are a little out of town so we caught a cab both ways for about €15-16 and it saved mucking around as we didn’t have a car.

c'est fermé du 8 janvier au 10 février 2018

(From Eastern holidays till the end of September) Guided tours of the Submarine Base and its bunkers (mainly K3) are scheduled every single day at 11:30 am and 3 pm in French. English Guided tours are scheduled every Tuesday at 11:30 am (Rate is 6,20 euros per adult). It is always possible to make a group reservation for other days (specific group rates in that case), l'Animation de la l'architecture et du patrimoine de la ville de Lorient is in charge of these group reservations. Hope that helps ! Enjoy you tour :-)