The one who started it all, will he have no descendants?
Dialing the communication number of the blonde girl, Nicole von Sasha, accidentally exposed Chen Fei himself.
Chen Xiao'er dared to make the first move, so don't blame others for responding in kind. The guilty has an origin and debt has an owner. Now that he's in the Heavy Criminal Prison, it saves others from coming to find him; who knows how many people wish to personally kill this guy.
What else could Chen Fei do? Wait until the passage to the surface is opened, invite the other party down for a visit, and then take a look... Holy crap! Thousands of Combat Mech, just ask if you're scared or not?
This is a civilizational-scale combat standard, not village-level, and certainly not city-level. If released entirely, even small sovereignties ranking outside the top 100 in national power would be utterly panicked.