A coal mine had been discovered in the southern sea. To make it convenient to mine it, they naturally had to build a road.
There was a small mountain blocking the road. If they took a detour, it would take a lot of time.
Zhao Pengfei thought about it and felt that digging a tunnel was more suitable.
This small mountain only needed to a 100 meter tunnel at most, but no one had any experience digging tunnels. They discussed for a long time before starting work.
After spending a month to build the tunnel, it was considered a symbolic milestone on the Carefree Kingdom's road.
With the experience, they would not waste so much time building tunnels in the future.
Zhao Pengfei rushed back to report the good news. Bai Wutong praised him and even rewarded everyone. She also brought him to see the asphalt extracted from oil extraction and taught him how to pave the way with asphalt.
