The Herne platform, an Extra-Large Autonomous Underwater Vehicle (XLAUV), is a collaborative project between BAE Systems and Cellula Robotics aimed at revolutionizing naval operations. Designed for flexibility and endurance, Herne is a 12-meter-long, 8–10-tonne platform featuring two modular payload bays with a total capacity of 5,000 liters. Its propulsion system, powered by lithium-ion batteries, achieves speeds of 8 knots sprint and 3 knots cruising, with the potential for future hydrogen fuel cell integration for extended endurance. Herne's design includes lateral and vertical thrusters for maneuverability and can operate at depths of 3,000 meters. The platform's modular construction allows for easy deployment and adaptability for various naval missions. During a recent demonstration on the south coast of England, the project team showcased the platform's capabilities and highlighted its role in augmenting naval capabilities. The project emphasizes continuous development, with a focus on creating a long-term solution that can evolve with advancing technologies and operational demands. Herne's design is built for flexibility, enabling upgrades and reconfigurations over time to integrate advanced technologies and meet emerging requirements in maritime operations.