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3 months agoI am aware of that, but Brest (or better said Ile Longue) is the base where the french nuclear ballistic missile submarines are stationed (https://en.wikipedia.org/wiki/%C3%8Ele_Longue).
In this article you can see the different buildings/bunkers, I went to all of them (as near as you were allowed) was very interesting (https://thebulletin.org/premium/2023-07/nuclear-notebook-french-nuclear-weapons-2023/).
Good thought, just remembered I had something similar one time when working at a festival. There it was because of wireless microphones that somehow interacted with the phone network.
Maybe some special equipment of the bases use special protocols that interfere with other devices that are not programmed for it.