Group 1 - The successful registration of the first underwater tunnel real estate rights in Guangdong province sets a precedent for complex marine engineering projects [1] - The project involves a new intercity tunnel spanning across Guangzhou and Zhongshan, with the underwater section under the jurisdiction of Nansha District [1] - The Nansha District Bureau of Planning and Natural Resources introduced a three-dimensional layered approach to the real estate registration process for the underwater tunnel [1] Group 2 - The three-dimensional registration acts as a "3D ID card" for the underwater tunnel, effectively managing multiple spatial relationships such as navigation, fisheries, and ecology [2] - This initiative enhances the efficiency of marine resource utilization and serves as a reference for future projects like underwater cables and offshore wind power [2] - Nansha District aims to promote this model to emerging sectors such as offshore photovoltaics and marine ranching, contributing to the development of a "blue economy" ecosystem [2]