Danger abounds along the way
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Engineers are on the line and workers are sweating every day
You may have to ask an archaeologist to break the ground and dig grooves for this work :D
The engineer at the construction unit probably sweats every day
The soil quality is good and the water table is low, otherwise it would be difficult to do this job.
This is true. If the situation you mentioned occurs, the difficulty will be increased eight times.
Salute, the founder of industrial civilization!
How much risk workers and engineers took to win your respect. Now look at the importance of underground pipe galleries.
Didn't the designer consider the original underground design drawings? What should we do about maintenance and inspection during operation of such a design in the future?