➀ Researchers at Nanjing University of Posts and Telecommunications in China have developed a prototype all-light communication network that achieves seamless connectivity across air, land, and underwater environments, even when communication nodes are on moving vehicles. The network combines different light sources and uses advanced optical systems for real-time data transmission. ➁ The system integrates various light-based technologies to support two-way real-time communication, ensuring reliable data exchange regardless of environmental conditions. Potential users include emergency responders, maritime operators, and researchers. ➂ The prototype demonstrated bidirectional light transmission between two moving vehicles using green, blue, and ultraviolet light, and achieved modulation bandwidths of up to 4Mbps.