User blog comment:Bahamut.Egg/Dressrosa Arc theories/@comment-2109035-20140327122059

A. >_>  Usopp with haoshoku... <_<

B. They weren't walls, it was the concrete foundation that went on for miles underground. They would have to drill their way out if they wanted to escape. But, the idea of a poneglyph being on Dressrossa isn't something I considered, and is actually a likely idea.