This issue brief introduction: On May 15th, Shenzhen, Guangdong Province, a construction site suddenly collapsed. The situation on the site was very dangerous. The monitoring screen showed that during the construction of the rain and sewage diversion project site, the workers were working in the pit and the excavator was in operation. The edge of the pit wall suddenly collapsed and the construction worker was buried under the ground. After the incident, several people quickly jumped to save their lives. The accident eventually resulted in the death of one worker on the spot. Another injured person was sent to hospital for treatment. The specific cause of the current accident is under further investigation and processing.