On May 18, 2021, the SEG Plaza, a 79-storey skyscraper in Shenzhen, China, began swaying unexpectedly, leading to panic among office employees and shoppers. Video footage showed the building shaking violently, prompting many to evacuate. Despite fears of an earthquake, China's earthquake monitoring organizations confirmed no seismic activity occurred at that time. Witnesses reported swinging lights and vibrations, and emergency teams quickly closed the building and surrounding streets for safety inspections. Investigations revealed that the unusual movement was caused by wind effects and vibrations from the building's rooftop antenna system. After thorough assessments, engineers concluded that the structure was safe, and the building reopened weeks later. This incident highlighted concerns about skyscraper safety in one of China's busiest technology hubs.