Core Insights - The article emphasizes the significance of Guangzhou's underground comprehensive utility tunnel network, which represents the city's "inner strength" and enhances urban resilience and efficiency [1][2][19]. Infrastructure Development - Guangzhou has invested approximately 10 billion in an 85-kilometer underground utility tunnel network, which has been under construction for eight years and is now operational [1][8]. - The network spans across five major districts: Tianhe, Yuexiu, Haizhu, Liwan, and Baiyun, consisting of four main segments: the ring city tunnel, Pazhou West District tunnel, Tianhe Smart City tunnel, and Guanghua Road tunnel [1][8]. Economic and Social Benefits - The underground network is expected to significantly improve water supply security in Tianhe by mitigating risks associated with saline tides from the Pearl River [3][5]. - The project is projected to release over 700 acres of land for development by relocating high-voltage power lines underground, enhancing land value in key areas [6][7]. Construction Efficiency - The construction of water supply pipelines within the underground tunnels is more efficient than traditional methods, saving approximately half the time required for surface excavation [4][6]. - The design of the tunnels allows for simultaneous construction without disrupting surface traffic, maintaining urban mobility [3][4]. Historical Context and Learning - Guangzhou's experience with underground utility tunnels dates back to the construction of the first comprehensive tunnel in the University Town in 2004, which has been operational for over 20 years [8][10]. - The city has adopted successful design principles from earlier projects, such as the "ring and radial" layout, which optimizes the network's efficiency [11][12]. Future Developments - The city plans to continue expanding its underground utility network, focusing on smaller, cost-effective tunnels that will complement the existing infrastructure [21]. - The ongoing development aligns with national policies aimed at enhancing urban infrastructure and resilience, providing a framework for future projects [20][21].