Perhaps they were accustomed to living in the underground refuge center. When the Eternal Night first descended, the survivors of Pengcheng were filled with fear, worried that other disasters might accompany the onset of the Eternal Night.
However, after about a week, the survivors realized that apart from the darkness, no other disasters had appeared. Thus, they gradually began to relax.
If the Eternal Night had descended immediately after the initial end of the electromagnetic pulse, the survivors of Pengcheng might have descended into chaos.
But now, with power restored, the onset of Eternal Night still had some impact, but compared to other natural disasters, the impact on the survivors had greatly diminished.
As the outside world gradually returned to normal, Dong Tianyu, fearing outsiders, filled the platform with shipping containers as originally planned.