Old Dunling was protected by complex systems and institutions. Although the storm obscured the view, Black Mountain Hospital maintained communication with the Broken Dome until a few hours ago when the communication was cut off. According to one of the disaster emergency protocols, the protocol was initiated after losing contact with Arthur and the entire Black Mountain Hospital, and the Cleaner Squad was deployed.
Just like their name suggests, Cleaners are responsible for mopping up the actions of the demons, and in certain special situations, they also tidy up the failed actions of the Purification Mechanism.
