Each of the three had a steel drill.

Just drill under the city walls.

In order not to make too much noise, they could only slowly chisel out a concave hole.

Made of reinforced concrete, it is naturally difficult to dig into it.

Fortunately, the three of them had perseverance and strength, so they grinded slowly, and finally opened a very deep opening.

But it's still not deep enough.

Tang Fei used the ...... again

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