"It was a peculiar coincidence, the space wormhole belonged to none other than the Metal Civilization.
Initially, when Metal Civilization observed that the expansion wave backflow was approaching the boundaries of the Star Zone, they decided to head towards the Cosmic Center for survival.
At that time, with their technological level, Metal Civilization couldn't withstand the expansion wave backflow; their only option was to escape deeper into space to find a way to survive. In order to stay as far away as possible from the expansion wave backflow, the Wandering, as the leader of Metal Civilization, after consulting with the rest of the civilization, decided it was faster and safer to use a space wormhole for escape. After all, traveling outside the wormhole would be slower, and there would be a possibility of war if they encountered other civilizations.
