Board Thread:Manga/@comment-26056057-20160509020829/@comment-27321453-20160519210711

I believe that miner hit the foot of one of the wall titans that's when his shovel broke. I think those wall titans are also 60 meters like the Colossal one but the reason they're shorter (and the reason Bertolt is able to look over the wall in the first place) is because they're 10 meters (or so) deep into the ground.