When Lin Shen was sorting out his father's belongings, he found an encrypted exploration log. One word was mentioned repeatedly in the log - "pulse signal". At the same time, while sorting out a batch of newly unearthed bamboo slips from the Warring States Period, Shen Qingci from the National Center for the Preservation of Ancient Books discovered that they contained modern hydrogeological maps - these drawings were surprisingly consistent with the hand-drawn drawings in Lin Shen's father's diary.
