While I do understand 'security theater' and think we could do better, I have to wonder what it's like crossing from an EU country to a non-EU country. People

While I do understand 'security theater' and think we could do better, I have to wonder what it's like crossing from an EU country to a non-EU country. People abroad look at our border crossings and react strongly, but I think most of the time they're going from France to Germany (example). I'd love to see tunnels like this for easy transit that doesn't waste surface area/acreage.