During the fifth edition of the Naval Innovation Days, Naval Group unveiled for the first time to the public its Large Unmanned Underwater Vehicle (UUV) demonstrator.=====================The underwater threat is becoming a major issue for the navies in the near future. The Oceanic Underwater Drone Demonstrator is a project that federates technological developments. One of the main challenges is controlled decision-making autonomy, which will be at the heart of the drone capabilities. This demonstrator will enable the design, qualification and validation of technological building blocks. This workshop presented at the Naval innovation days highlights the opportunities for agile development, together with the French authorities and our partners, to provide advanced systems dedicated to tomorrow’s underwater warfare.