The Bastion's interior was vast. Even with its thick outer shell and core power, it could still house three million people. This was excluding the severely damaged and sealed dangerous areas. Otherwise, even five million people would be able to fit in.
However, the progenitors of the Prokles were low. After so many years of development, they still only had a population of a million.
When the chaos began, the prokans who could fight all picked up their weapons. The remaining old, weak, women, and children followed the guidance and entered the sanctuary deep in the bastions, waiting for the crisis to pass before coming out.
The terrible disaster described by their ancestors was a lingering shadow. The people of prokke were afraid of the disaster repeating itself, so they had already built a sanctuary to ensure that their race could continue after the disaster.