Unmanned Underwater Vehicles (UUVs) are robotic platforms designed to operate below the water surface without an onboard human crew. UUV technology includes Autonomous Underwater Vehicles (AUVs), Remotely Operated Vehicles (ROVs), hybrid systems, underwater gliders, crawlers, and large or compact platforms configured for specific missions.
This page features leading UUV companies supporting hydrographic survey, mine countermeasures, subsea infrastructure inspection, and marine research operations.
Read the Technology Overview
Cutting-Edge Unmanned Systems, Counter-UAS Solutions, and UxV Technology for the Modern Battlefield
Autonomous Underwater Drone for Subsea Exploration, Survey and Inspection
Autonomous and Unmanned Marine Vehicles: USV, AUV, Marine ROV; Profiling Floats & Towed Systems
Hybrid Underwater Robotic Systems for Subsea Use in Civilian, Security & Defence Sectors
Leading-Edge Solutions & Services for Defense, Ocean & Marine Energies Applications
Innovative High-Resolution Subsea Imaging and Power Technologies for Commercial, Scientific & Military Underwater Survey Missions
Integrated Systems & Payloads for Unmanned Surface & Underwater Platforms Operating in Complex Maritime Environments
Cinematic Underwater Robotic Vehicles (ROV & AUV) for Inspections, Observation and Videography
Marine Autopilots, Unmanned Surface Vehicle Communications, Power Management Modules & Marine Simulators & Software
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Unmanned Underwater Vehicles (UUVs) are robotic platforms designed to operate below the water surface without an onboard human crew. UUV technology supports missions that are difficult, repetitive, hazardous, or costly for divers and crewed underwater vessels. Depending on the design, vehicles may operate autonomously, remain connected to an operator, or combine both approaches.
Unmanned underwater vehicles are used for defense, hydrographic survey, offshore inspection, marine research, environmental monitoring, and search operations. Their capabilities vary according to vehicle size, depth rating, propulsion method, endurance, navigation architecture, communications, and payload configuration. Although the term UUV is often associated with untethered vehicles, broader usage can also include tethered and hybrid unmanned underwater systems.
Autonomous Underwater Vehicles (AUVs) are free-swimming UUVs that perform missions without continuous operator control. An AUV typically follows a programmed route while using onboard navigation, control, and sensor systems to maintain depth, heading, and position. More advanced systems can respond to obstacles, environmental conditions, or sensor observations and adjust aspects of a mission while submerged.
ecoSUBm-Power+ v2 AUV by ecoSUB Robotics
Remotely Operated Vehicles (ROVs) maintain a physical tether to a surface vessel, platform, or control station. The tether can provide power, high-bandwidth communications, and real-time video, allowing operators to directly control the vehicle and its tools. ROVs are particularly suited to subsea inspection, intervention, maintenance, and tasks requiring continuous human oversight. In some classification systems, ROVs are treated separately from UUVs.
Hybrid AUV/ROV systems combine autonomous and remotely operated capabilities. They may travel or survey independently before switching to supervised or tethered operation for close inspection or intervention. This can reduce dependence on surface support while retaining operator control when detailed assessment or manipulation is required.
Underwater crawlers travel across the seabed or submerged structures rather than relying entirely on free-swimming propulsion. Tracks, wheels, magnetic systems, or other attachment mechanisms can provide stability during inspection and intervention. These underwater unmanned vehicles are useful for close-proximity work where maintaining a stable position is important.
Underwater gliders change their buoyancy to move vertically through the water and use wings to convert that motion into slow forward travel. Their low-energy propulsion supports missions lasting much longer than many conventional battery-powered UUVs. Gliders are well suited to oceanographic monitoring, although their low speed and limited payload capacity restrict some applications.
Large and extra-large UUVs provide greater internal volume for energy storage, sensors, underwater communications equipment, and mission payloads. Their size can support longer-range operations, greater endurance, and increased payload capacity. A large military UUV may also support persistent sensing, payload carriage, or other undersea missions requiring substantial endurance.
Micro and mini UUVs prioritize portability and ease of deployment. Their compact size can allow operation from small boats, shore locations, or platforms with limited launch infrastructure. Although payload capacity and endurance are more constrained, smaller unmanned underwater drones can support localized surveys, confined-area inspection, training, and distributed sensing.
Phantom 2 UUV/AUV by Dynautics
UUVs can collect bathymetric data and acoustic imagery while following controlled survey patterns above the seabed. Sonar and positioning systems support hydrographic charting, route assessment, habitat mapping, and detailed characterization of underwater terrain. Operating closer to the seabed can also support high-resolution data collection in deep water without towing sensors from the surface.
Military UUV systems can support mine countermeasures by searching defined areas and collecting data for the detection, localization, classification, and identification of potential threats. Autonomous sensing can reduce the need to place personnel or crewed vessels directly within hazardous areas. Similar UUV technology can support wider undersea domain awareness through persistent or repeatable observation.
Unmanned underwater vehicles can inspect pipelines, subsea cables, offshore platforms, risers, foundations, and other submerged infrastructure. Sonar and optical payloads can document condition and identify anomalies for engineering assessment. Autonomous systems are useful for long survey corridors, while ROVs and hybrid platforms can provide closer inspection or physical intervention.
Scientific UUVs carry instruments that measure physical, chemical, biological, and acoustic properties of the ocean. Missions can include water-column profiling, ecosystem observation, current measurement, pollution monitoring, and repeated environmental surveys. Long-endurance platforms such as underwater gliders are especially useful when measurements are required across broad areas or extended periods.
Underwater unmanned systems can search for shipwrecks, aircraft, lost equipment, cargo, and archaeological sites. Sonar supports wide-area detection where visibility is poor, while cameras can provide detailed imagery after an object has been located. A search UUV may also work alongside an ROV equipped with manipulators or recovery tooling.
The effectiveness of an unmanned underwater vessel depends on the sensors, navigation systems, communications equipment, and payloads it carries:
Together, these payloads determine what a UUV can observe, measure, communicate, or physically accomplish during deployment.
Several developments are extending the autonomy, endurance, connectivity, and operational flexibility of unmanned underwater vehicles:
As these technologies mature, UUV manufacturers and integrators are increasingly focused on complete system architecture, including autonomy, energy, payload integration, communications, launch and recovery, and the supporting infrastructure required for reliable underwater operations.
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