Core Viewpoint - The closing ceremony of the 15th National Games showcased the world's first "city panoramic closing ceremony" at the newly constructed "Sea Theater" in Shenzhen, which was completed in just 230 days, nearly 100 days ahead of schedule [1] Group 1: Theater Design and Technology - The "Sea Theater" features the largest and most complex water stage in China, with a total area of 3,790 square meters, including a 40-meter square main stage [3] - The stage design includes two "rolled corners" that can fold to heights of 10 meters and 4 meters, creating a lightweight and dynamic visual effect [3] - The stage is equipped with two power systems, including four winches in deep water and hydraulic jacks in shallow water, allowing for rapid transformation within 10 seconds [3] - The stage's steel structure is protected by a three-layer special coating that is only 240 microns thick, using food-grade stainless steel and advanced anti-corrosion materials [3] Group 2: Audience Experience - The theater's 4,000 square meter canopy, made from a high-performance aerospace material called STFE, provides a transparent experience while withstanding 14-level typhoons [4] - The STFE material filters nearly half of the natural light and 40% of heat during the day, enhancing audience comfort [4] - The theater employs a high-density porous sound-absorbing material developed by the Chinese Academy of Sciences, reducing environmental noise to one-sixth of its original level [6][7] Group 3: Construction Efficiency - The theater was constructed using highly prefabricated building techniques, with 2,500 fixed seats assembled from 520 pre-cast concrete components, achieving millimeter-level precision [8] - The design allows for future expansion, enabling the venue to accommodate up to 8,000 people [8] Group 4: Cultural Impact - The innovative water stage has sparked significant public interest and discussion on social media, highlighting its unique engineering and aesthetic appeal [9] - The theater is set to become a cultural landmark in Shenzhen, contributing to the cultural life of the Greater Bay Area [9]