The security there is tight anyway. They let groups of about 20 into a “holding area”. Then you have to walk through detectors to get to the dome area(if memory serves me correctly). I think I remember 1 entrance and 1 exit to the dome.
Funny story, we were at a Weinachten Market the night before and my husband bought a smoked eel. It got on his gloves which he stuck in his pocket. While we were in the holding area, the smoked eel smell became very apparant and everyone was talking about a smell...!!!
“Is that a smoked eel in your pocket, or are you just ....?”