The Tactical Undersea Network Architectures (TUNA) initiative, under the auspices of DARPA, aims to develop and demonstrate cutting-edge optical-fiber-based architectures to rapidly restore tactical data connectivity in denied or degraded maritime environments. In this initial phase, the program is focused on advancing innovations across three technical pillars: (1) holistic system architecture integration; (2) ultra-lightweight, neutrally buoyant, rapidly deployable optical fiber solutions; and (3) modular buoy node design.

System design efforts center on enabling a modular, tactically adaptive architecture that can interface seamlessly with military data networks and be deployed with minimal signature. Cable system contributors are exploring the use of small-diameter, unpowered optical fibers engineered for persistent survivability, targeting operational lifespans of at least 30 days in dynamic maritime conditions. Simultaneously, buoy node teams are engineering compact, rapidly deployable network relay platforms that can support dynamic, mission-critical communications.

DARPA anticipates a follow-on phase to operationalize a full-spectrum, end-to-end system for laboratory validation, high-fidelity simulation, and at-sea experimentation. Select organizations with demonstrated operational expertise in undersea cyber-physical security, including CyberSEA Technologies, contribute concept-level engineering solutions and dual-use cyberintrusion mitigation strategies that may be incorporated into future TUNA architecture enhancements.