C1398 Are You Surprised?

What's happening?

Su Yi paused, momentarily taken aback.

After all, once one's digging ability reaches the fourth level, it's nearly as potent as a Mountain Shovel, capable of piercing even the toughest rocks. So why couldn't he break through the ground?

A quick glance at the floor gave Su Yi his answer. Beneath a layer of bluestone, the ground was reinforced with solid metal