No one noticed.
Just as the group reached the front, an official was explaining the tunneling principles of this ten-million-yuan shield machine to Lu Chengwen.
Behind them, two minor figures were secretly tampering with the hydraulic support equipment.
The underground excavation face resembled a cylindrical passageway a little over a person's height.
In a space like this, the rock, soil, and shale coal seams overhead could constantly fall away. In mining terminology, this was called a "roof collapse."
Once a roof collapse occurred, it would be world-destroying. Anyone beneath it would either die on the spot or be buried alive. In the mildest cases... only a small amount would fall, injuring or crippling the workers.
That was why support equipment was indispensable. Holding up the ceiling and preventing it from collapsing was especially important.
Old Ma had carefully selected this tunnel. The ceiling was fragmented, and without support, a roof collapse was inevitable.
This was the "graveyard" he had meticulously prepared for Lu Chengwen.
The two trusted men kept retreating as they tampered with the support equipment, leaving large sections of the ceiling unsupported...
So here, it truly could be called heaven collapsing and earth splitting.
The collapse behind them had already sealed off their escape route.
In the space ahead, only an area of several dozen square meters still had support.
There was a shield machine half buried beneath rubble, more than a dozen support pillars, and ahead of them stood a pitch-black coal face marking the end of the tunnel.
Everyone was stunned.
Everyone froze in place, staring at the collapsed rock layers and chunks of coal behind them, listening to the continuing rumble, utterly dumbfounded.
After a long while, the rumbling stopped.
The group remained motionless, looking from one person to another.
The official who had been