No one can imagine that in the deep underground of this hotel near the cliff, there is a site of absolutely no small scale.

The ground is not dim at all. The light of the searchlight illuminates this place like daylight. Dozens of builders work day and night, and the sound of the machine never stops.

Because each floor of the hotel has a thick sound insulation, the noise generated here will not affect the hotel guests.

It seems that in order to further reduce the sound, there are no large excavators in the tunnel, all of which are small machines.

When you go in, you can see that a...