First of all, well done to the dev team for getting this far, I'm very much looking forward to the completed product.
One of the issues I had in a recent game was this: Water was flooding my tunnels, only about five blocks from my home base, and the dwarfs were panicking. I hastily laid down walls to block in the water, saving the day yet again. I ended up having a fairly large stretch of nothing but wall. Quickly, the now incredibly grateful dwarfs approached my wall - perhaps to offer thanks for yet again saving their lives. But no.
They dug through the damn wall. Killing everybody.
Clearly, these dwarves are in need of help. Perhaps walls should be created undiggable, unless marked otherwise?
