I remember a scene in 21 wherein the actor was tested under pressure and so he was advise to go to a underground place and played and then they put a sack on his head and test him if he can still remember his card count. Perhaps that's what the atmosphere on some of those underground casinos.
It’s definitely a different atmosphere and one thing for sure is not regulated.
What’s interesting about underground casinos is that you can dress however you want, and as long as you have money, you’re welcome. If you bet big, you're treated like a VIP - no questions asked.
And who hasn’t seen the movie 21, right? That was such a good film all about card counting. I believe it still happens today, but with advanced cameras and tech, patterns of winning can be tracked, and in the long run, you might get exposed.
That’s why doing it in an underground casino is super risky.. you never know, you could end up in serious trouble… or worse...