My MC and her companions have reached the city they've traveled to, and now, they're about to sneak into it. It's protected by a giant wall, akin to the Berlin Wall/Great Wall of China/etc. However...it's not an ancient setting by any means. It's a very high-tech place, marked by surveillance, cameras, guard towers, etc. It's a fantasy city that's supposed to be extremely Orwellian, more so than the characters are used to, as they're from the wilderness areas where things are set back 100s of years. Is there any way I can do this besides having them just dig a hole? Also, might they stay hidden once they cross - wouldn't there be guards who are on alert and ready to shoot? I know it's a fantasy and all but I still want to make it believable. I think if it's too easy for my characters to get in, that creates a plot hole - why haven't more invaders succeeded, and why haven't more people within the city gotten out? Any ideas are deeply appreciated, and I give +rep.