My husband has been out for 4 years. Back then, even as a wife, I was very closely supervised whenever I came near the boat. And there was no way I could even get down to the subs without a lower base sticker and showing my military ID.
Which is how it should be. It is beyond my ability to grasp how this people could even get this close to a nuclear sub, let alone on it.
But fortunately this is a Brit problem, so I can still labor under the illusion that security at our bases is better than that.