One of the most interesting books I've read on the topic. The guy has made several attempts (and paid for it a terrible price).

https://www.amazon.com/Inclined-Escape-Yuri-Vetokhin/dp/B001...

People accidentally cross borders.

Another well know case was three sailors from the UK, Canada, and New Zealand who accidentally sailed into Cambodian waters during the reign of Pol Pot. They ended up being burnt alive after months of torture at the infamous S-21 building.

Turns out the "burnt alive" part is unsubstantiated: https://en.wikipedia.org/wiki/John_Dawson_Dewhirst

Still a terrible story, though.