This clock stopped working at exactly 11:40pm when the massive Tianjin explosions occurred on Wednesday night, due to explosion shockwaves. The time when the tragedy takes place is forever sealed in this man-made machine. It reminds people of the massive Wenchuan earthquake on the afternoon of May 12, 2008, which killed about 70,000 people. At that time, a clock also mysteriously stopped working when the earthquake hit the area.