As global connectivity becomes central to several critical societal functions ranging from disaster relief and climate monitoring to defense and underwater exploration, today’s wireless infrastructure must evolve beyond isolated domains. Specifically, traditional wireless networks, confined to a specific terrestrial, aerial, or underwater environment, fall short in supporting coordinated and resilient operations across these heterogeneous domains. Addressing this challenge and motivated by the need for a unified high-performance communication architecture that spans land, air, and sea/ocean, this project aims to lay the foundation for an integrated network that leverages optical, radio-frequency (RF), and acoustic wireless technologies to connect aerial nodes (e.g., drones and high-altitude platforms), terrestrial wireless devices (e.g., mobile phones), and underwater nodes (e.g., autonomous underwater vehicles) into a cohesive system, referred to as Integrated Air-Ground-Underwater Network (IAGUN). The hybrid use of optical and RF communication modes (or optical and acoustic communication modes in underwater scenarios) offers complementary advantages, enabling faster, more secure, and more reliable communications than either alone can achieve. The project also features an educational and outreach component that supports interdisciplinary training at the intersection of optical communications, wireless networking, and machine learning. Students will gain hands-on experience i