It's a smart move cause if there's a leak all countries point their finger to each other. They have a big opportunity right now that will gets void is there is a leak
I understand the doctor but starting from the ground up is hard. Maybe there is documentation about that he needs but that's kinda primitive in his eyes. Or he needs a cheat skill like the protagonist from Parallel World Pharmacy
Egyptians farmers were had to help building pyramids and such when it was flood season (can't remember when that season was) or periods they can't work on land. I understood what mitsuha proposes is kinda the same
When they heard about the viscountess they were thinking of a raise and wants something that can't be seen in daylight... so cleaning up the staff service her in the long run
If you have a wife, children and such? prepare to fight. If you think yourself can't handle slave life? Prepare to fight. There are so many reasons why you should pick-up arms