Essentially, the man only wants money.
The junior employee didn't dare to even scream in pain when money was mentioned, letting the fists fall on him.
He had no money. If he weren't poor, who would be willing to enter the mine? Every mine is dangerous.
Especially the mines in space—if the spacesuit gets damaged or the mine collapses, there's no chance of survival at all.
Nowadays, many mines are being developed by robots, but robots are nowhere near as cheap as manual labor, and machines also need rest and energy replenishment.
Someone must oversee them to ensure that if these robots malfunction, someone can promptly retrieve them.
If the junior employee weren't poor, he wouldn't be doing this job.
He was merely helping a mine owner lead people into the mine; he went in at the time too. When they came out, everyone was fine, so how could he have known his son would go missing?
