A super dust storm swept across the world, blocking out the sun and paralyzing all systems. In the ruins of the city, urban planner Lin Wan discovered the secret left behind by his father - the "Deep Blue Project" buried deep underground was not an ordinary civil defense project, but a plan to preserve the fire of civilization that would last for thousands of years.
As her journey of survival deepens, she forms an alliance with geologist Lu Chen, doctor Su Yu, special soldier Chen Zhigang and others, but gradually uncovers the shocking truth: this disaster is not a natural disaster, but a purge launched by an organization called "Purification Fire" to "optimize humankind". What's even more shocking is that they discovered that an ancient network composed of seven ruins around the world is waiting for the "appropriate key" to be activated - and Lin Wan's bloodline is the key itself.
During the seventy-two-hour countdown, the team split up to take action: the power struggle in the military fortress, the genetic mutation crisis at the medical station, the ancient ruins deep in the desert, the consciousness network connection of survivors around the world... At the same time, the ancient existence sealed underground is quietly awakening.
