The Screw Rock Excavator, a special machine from interstellar trade, if its core components suffer a severe failure, cannot be repaired on Source Star. It must be returned to the seller through interstellar trade, repaired at a great cost, and then sent back.
This round trip takes decades, longer than the lifespan of the people of Source Star.
However, it's not easy for it to break down to the point of needing factory repairs. Even if it's attacked by a Level Five Ruined Beast and the Professionals inside are blasted to bits, its core components, like the dashboard, would remain intact.
But with large numbers, accidents are bound to happen. It's still said that Screw Rock Excavators are constantly traveling through space every day.
Due to the rarity of this equipment, new mines usually operate at only 50% capacity.
Thus, if there are 24 people participating, only 12 excavators are available.
This machine is used in two shifts, with each person using it for eight hours.
