So I've been rewatching Korra again and I still can't help it, but in this episode, why didn't Bolin just earthbend the walls that is behind them? It is not fricking metal! Man these guys ain't thinking outside the box.
That is from Season 3 Episode 10 of Legend of Korra. Here is another screenshot in case you need a refresher. It is the episode where Zaheer sucks the air out of the Queen. And just look at that. They are surrounded by rock walls which looked to be easily earthbendable.
Possibly they don't think it's worth the risk of trying to escape? There's still guards and the like to worry about, and in an Earth kingdom i would imagine they take precautions against people using earthbending to escape.