48 Hours before the cold wave arrived, a red alert of "National Emergency Deduction·Internal Beta Version" popped up on the mobile phone of single mother Lin Zhiyu. She was a scientific researcher on the project. Instead of panicking, she dialed her mentor's coded phone number: "The organization has received it and will be on standby." When the military truck broke through the wind and snow, her military husband, who had been missing for three years, stood in front of her and saluted: "Next, you will be responsible for science and I will be responsible for safety." In this life, she wanted to take her son and survive with the country - but she did not expect that something behind the iron door that had been abandoned for ten years on the third floor of the underground would wake up.
