There are many reasons why Yamao detonated the bomb in the emergency passage. One is to test the performance of the bomb to see if it is powerful enough to blow up the dam. He bombed the dam because he robbed the jewels eight years ago and put them in his old village, which has undergone earth-shaking changes in the eight years since he surrendered himself to prison. The reform of the governor of Tokyo made him have his original home (he surrendered to the prison and put all the stolen jewels in his former home, but he didn't expect to stay for eight years. Later, Conan also mentioned in his analysis that the bombs used in dams and emergency passages are the same material; The second and most important point is that the Governor of Tokyo introduced him at the beginning. Knowing that the governor of Tokyo will attend a ceremony in Kitazawa village in a few days, Yamamoto's arrival will inevitably be followed by a large number of police and reporters, which will seriously hinder his plan to bomb the dam to get jewelry, so he sent an anonymous threatening letter to the governor of East JD.COM earlier. He learned that the JD.COM Line Railway has just been completed, and the Governor of Tokyo will attend the ceremony. And get on the Shinkansen Railway, just meet the emergency passage in the high-speed tunnel, which is also convenient for him to escape from the emergency parking area. So, it was the best time for him to detonate in that place. Although Conan's suspension did not lead to a tragic ending, the governor of Tokyo was too scared to attend the ceremony in Kitazawa village after this incident, so the ceremony was cancelled and his purpose was achieved. After you answer, you can ask me if you don't understand anything. Please adopt it. Thank you, thank you, thank you.