I wonder if those employees are being paid in bitcoin with their salaries. Given the hazards of working at such an environment, they should at least be getting some incentives to cover for the maintenance work they have to attend to, plus being far away from their families.
Probably not, the conditions in China when it comes to your workplace are not the best, I have my doubts they even know what they are doing at all, that way by keeping them ignorant about the purpose of the operation then you can avoid paying them in bitcoins.