Extra large UUV. The US Navy envisions the XLUUV as a modular, open architecture system that can be reconfigured with different payloads. The vehicle will be able to be launched pier-side without needing to be carried aboard a host ship. The XLUUV will differentiate itself from current submersible systems by its greater endurance and payload capacity, including the potential to perform offensive manoeuvres while submerged underwater.