Ark’s apocalyptic line, but the fourth natural disaster!

After Tu Shanyao woke up, he found that he was in the world of Arknights, and it was the world line of Haiji Deshishi.
After struggling to survive for a period of time, a 'plug-in' called the Survival Base found him.
Through this survival base, he can actually summon players from the earth.
Ever since, the story of the fourth natural disaster began.