Core Viewpoint - Hainan province is innovating its marine space management by implementing a three-dimensional layered usage rights system, allowing multiple projects to coexist in the same marine area, thus enhancing resource utilization and opening new avenues for marine economic development [3][5][6]. Group 1: Policy Innovation - Hainan has introduced a layered marine usage rights system, dividing marine space into four layers: water surface, water body, seabed, and subsoil, which can be allocated separately [5][6]. - The implementation of this system aims to resolve conflicts over marine space and improve resource utilization efficiency [6][8]. - The new regulations have gained national attention and are being promoted as a model for marine space management [5][6]. Group 2: Project Implementation - The Hainan underwater data center project is the first of its kind to utilize the layered marine usage rights, occupying only 14.46 hectares and demonstrating the potential of multi-layered marine development [4][8]. - Other projects, such as the bridge construction in Sanya and the aquaculture project in Lingshui, have also successfully utilized the layered approach, marking a significant shift in marine space management [8][9]. Group 3: Market Mechanism Enhancement - Hainan has developed a "land supermarket" platform where marine usage rights are made available for enterprises, increasing transparency and convenience in the application process [11][12]. - The "clean sea" allocation model allows for streamlined approval processes for aquaculture projects, significantly reducing the time and effort required for obtaining marine usage rights [11][12]. - As of now, 155 marine plots covering approximately 280,000 acres have been listed on the platform, with 18 plots totaling 38,600 acres already allocated [12].