My Black Tech Shelter

Meteorites fell from the sky, blocking the sun. In a land of ice and snow, there were scattered shelters. Lu Chen held a nano core in his hand. He started by learning knowledge by himself, and used the nano core to realize his ideas step by step, develop technology, and strive to survive. Can he finally walk into the starry sky?
The story begins three days before the meteorite fell
PS: The beginning of the disaster article is similar, but the content is different