Duke maintained this state, like a tireless combination of a tunneling machine and refinery, devouring his way along the richest main vein of the Seaheart Iron Vein.
Vivian remained inside the mobile golden sphere, watching the scene in stunned awe.
She could see the blue ore walls around them rapidly vanish as though gnawed away by an invisible beast, replaced by ordinary Rock Walls that were continuously pushed aside and compacted.
Deep underground, they were crazily plundering this vein in an utterly inconceivable manner.
The process was incredibly efficient, thousands of times faster than any conventional mining method.
Wrapped in yellow sand deep underground, Duke and Vivian were like an efficient yet greedy devouring beast, charging madly along the richest main vein of the Seaheart Iron Vein.
The process also caused devastating damage to the surrounding geological structure.
The originally dense main vein, interwoven from Seaheart Iron ore and rock, instantly became extremely loose, fragile powdery residue after its essence was extracted.
This residue simply could not bear the immense pressure of the hundreds of meters of rock layers above and around it.
At first, only the areas Duke and the others had passed through quietly collapsed and compacted behind them.
But as the area they absorbed grew wider and their speed increased, the hollowed-out sections of the vein became ever larger.
Far behind Duke and the others, the severely excavated underground rock layers let out groans of unbearable strain before a massive chain collapse erupted.
Like falling dominoes, the collapse rapidly spread along the damaged main vein.
Immediately afterward, the rock layers above and around them also began to fracture and sink on a massive scale.
Behind and around Duke came the thunderous sound of collapsing strata, as if the entire underground world were coming apart.
He did not