Executive Summary
The U.S. Navy’s selection of Kongsberg’s HUGIN and Oceaneering’s Freedom under its Large Displacement Unmanned Underwater Vehicle (LDUUV) effort signals something more important than another autonomous-vehicle trial.
The Navy is evaluating two fundamentally different approaches to undersea perception.
HUGIN is optimized to search large areas, accurately map the seabed, and classify objects at operationally useful ranges. Freedom is designed to maneuver close to subsea infrastructure, inspect complex geometry, and autonomously investigate anomalies.
One is an acoustic surveyor. The other is an acoustic inspector.
The provocative question is therefore not which vehicle is better. It is whether the Navy has finally recognized that no single sonar architecture can efficiently perform every undersea mission.
From Commercial Maturity to Naval Capability
In February 2024, the Defense Innovation Unit awarded Kongsberg a 24-month contract supporting the Navy’s LDUUV prototype effort. The agreement contemplated HUGIN Superior and, potentially, the larger HUGIN Endurance. Oceaneering was also selected to develop and test Freedom, followed by an October 2024 contract to build a vehicle and establish an Onshore Remote Operations Center.
The selection logic is clear: both companies offered mature commercial technology, existing supply chains, proven autonomy, and operational experience accumulated outside the traditional naval acquisition system.
That matters. The Navy is not paying industry to invent an AUV from a blank sheet of paper. It is importing systems already shaped by deep-ocean survey, offshore-energy inspection, and demanding commercial operations.
Kongsberg subsequently delivered the first HUGIN Superior after acceptance testing in early 2025. Contrary to some reporting, the vehicle publicly confirmed as delivered was HUGIN Superior, not HUGIN Endurance. Kongsberg describes the delivered system as immediately relevant to mine countermeasures, seabed warfare, infrastructure inspection, and Intelligence Preparation of the Operational Environment.
HUGIN: Wide-Area Acoustic Intelligence
HUGIN Superior’s primary acoustic instrument is the dual-receiver HISAS 1032 synthetic-aperture sonar.
Unlike conventional side-scan sonar, whose along-track resolution deteriorates with range, SAS combines multiple spatially separated pings into a much longer virtual array. The result is approximately 5-by-5-centimeter imagery at 200 meters, with useful operation extending to 500 meters at lower vehicle speeds.
This is not simply “better sonar imagery.” It changes mission economics.
HISAS can search and classify across a broad corridor while maintaining nearly range-independent along-track resolution. Its interferometric processing also produces bathymetry, connecting the acoustic image to three-dimensional seabed structure.
The accompanying EM 2040 MkII multibeam echo sounder operates at 200, 300, or 400 kHz and provides wide-swath bathymetry, multiple detections, and water-column recording. A sub-bottom profiler examines sediment layers below the seabed, while forward-looking sonar supports terrain following, obstacle avoidance, and under-ice operation. The HUGIN Superior specification shows how these sensors form a complementary acoustic stack rather than a collection of unrelated payloads.
HUGIN’s focus is coverage, geolocation, and classification: find the object, position it accurately, and place it within the wider operational environment.
Freedom: Close-Range Acoustic Inspection
Freedom approaches the problem differently.
Its eight-thruster architecture provides six-degree-of-freedom control, allowing the vehicle to stop, hover, reverse, orbit, and maintain a precise inspection geometry. This makes it particularly valuable around pipelines, cables, structures, and other confined or geometrically complex targets.
Payload configurations (according to my sources) combine SeaBat T20 multibeam sonar, Voyis Observer Pro Camera and Laser scanning, and Sonardyne SPRINT-Nav acoustic-inertial navigation. Freedom has demonstrated pipeline tracking at altitudes as low as three to five meters and can gather detailed inspection data in a single pass.
Its COMPASS software analyzes sonar and computer-vision data onboard. When it detects a free span, burial, crossing, or other anomaly, the vehicle can trigger a closer inspection behavior instead of blindly completing a pre-programmed survey line. Oceaneering describes this as feature-based navigation.
The exact payload configuration of the Navy vehicle has not been publicly disclosed. What the commercial baseline demonstrates, however, is a shift from sonar as a passive data collector to sonar and laser as an input to autonomous decision-making.
Strategic Summary
HUGIN is built to answer: What is on the seabed, and where is it?
Freedom is built to answer: What is happening to this specific object, and should I investigate further?
That distinction matters. The future of undersea autonomy will not be decided by vehicle endurance alone. It will be decided by how intelligently platform dynamics, navigation accuracy, sonar frequency, aperture, coverage, processing, and mission logic are engineered as one system.
A poorly matched payload turns even an excellent AUV into an expensive data-collection exercise.
If you are developing or procuring an uncrewed maritime platform, I help organizations select and integrate the right payload for the right vehicle and mission, from sonar architecture and navigation performance to power, data, autonomy, and operational trade-offs.
Message me with PAYLOAD if you want to discuss what your platform actually needs to sense beneath the surface.
Originally published in the Strategic Pings ))) newsletter on LinkedIn on 2026-08-11. Subscribe there to get new editions first.