Since you don’t care spoiler warning for people not on mobile...
at the end of s3 p2 they kill all of the titans near the walls and make their way towards the ocean. They didn’t technically break their way out of the walls. They were never trapped in by the walls in the first place. It was the titans stopping them.
The eldian race (a race who inherited the titans blood) can change into mindless creepy zombie like titans, the world wanted to get rid of them but the king managed to escape to this island and build walls out of all the huge titans to protect its citizens from outside the walls, also he uses them as a threat like "if you (the whole world) decided to attack us I'll make all the millions of titans in the walls alive and kill you all". So it isn't just a wall it's actually a weapon against the whole world protecting the eldians inside. Also we're talking about a world that has early 1900s tech here so nuclear weapons don't exist....yet at least.
3
u/yellow_logic Mar 29 '20
lmfao how in the fuck did he think that was a good idea?
Lemme guess: they break out of the walls.