system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: In this day and age how the hell can people escape from prison?
gpt
At the end of the day, a prison is a building with a security system limiting what goes in and out of it, and security systems are subject to flaws unforeseen by those who create them. 

Consider how often we hear about security breaches in million dollar, professionally built computer systems. Hackers look for flaws in those systems to exploit and gain entry. In a similar vein, those who are able to escape from prisons have simply found a way to hack the prison's security system. Perhaps a door that must be manually locked is forgotten or missed by a lazy or tired guard. Or poor maintenance has led to a section of fence which can be pushed open. 

When you have an imperfect security system being analyzed on a daily basis by a group of people who would like to break through it, sooner or later one of them will succeed.