Lei Ting frowned and said, "No one has ever come to this place before, so what caused the sudden outbreak of zombie infections in humans?"
Others wanted to ask the same question.
Gu Shengyin pointed to the bottom of the coffin: "Look, the crack in this coffin is at the bottom, which means, those black gases slowly seeping out mostly merged into the ice layer. In recent years, due to severe destruction of Earth's environment and the continuous increase of carbon dioxide, many glaciers started to melt."
Her expression became serious: "Have any of you ever considered, what if, the part of the glacier that melted contained the Infection Source? Do you still remember the global rainfall that lasted for half a month just before the apocalypse arrived?"
As soon as she said this, everyone remembered; indeed, zombies began to appear during that global climate change event, claimed to be a rare occurrence in ten thousand years.