Fortunately, the frozen ground in winter was hard enough not to worry about collapsing from above, but the downside was that the one-foot-thick frozen soil at the beginning of digging was truly life-threatening.
It even required the use of Inner Qi to excavate, but after that stage, the digging became much easier, and surprisingly, all the soil was dry!
This was why Xuu You dared to dig the tunnel to three people's width, but reaching this extent also put a lot of pressure on Xuu You's work, happily it was completed successfully.
Fortunately, after widening the tunnel, the digging speed increased accordingly and didn't waste much time. As for the excavated soil, it had now turned into frozen earth city walls.
