Quieter handling and more reach, HII’s REMUS 300 takes on tougher underwater jobs

Reviewed: ad hoc news Accessory & Components desk. Edited and checked on 2026-06-17, 10:51. Details in the imprint.

With the REMUS 300, HII sends a torpedo-shaped underwater robot through dark, cold water that quietly maps the seabed and hunts for mines while its operators sit dry and warm in a control van. The compact autonomous underwater vehicle feels almost like a smart, modular tool chest for the sea floor.

What the REMUS 300 is built for

The REMUS 300 is a modular, man-portable autonomous underwater vehicle designed for mine countermeasures, hydrographic survey and seabed intelligence tasks. HII positions it as a next-generation system for navies that need longer reach in a backpack-sized hull.

The vehicle derives from the US Navy’s Lionfish program and is intended for both military and commercial customers, including research institutions and offshore operators, who want detailed, repeated mapping of coastal and harbor areas.

Range, endurance and payload options

At first glance the REMUS 300 looks like a small torpedo, roughly man sized, but inside it squeezes battery modules that enable up to 10 hours of endurance and a depth rating of 305 meters in its standard configuration. That gives operators an entire shift of underwater data collection.

The interior is arranged as three sections, with swappable batteries and payload bays that can carry side-scan sonar, multibeam echo sounders or environmental sensors, depending on mission needs. This modularity means one base vehicle can alternate between mine-hunting, survey and scientific roles with relatively quick turnaround.

How it works in the field

In practice a crew typically launches the REMUS 300 from a rigid-hull inflatable boat or small craft, sliding the yellow cylinder over the side and watching it disappear beneath the surface with a quiet push of propeller. Above water they monitor its progress on laptops, following pre-planned tracks.

The vehicle navigates using inertial sensors, Doppler velocity logs and acoustic transponders, holding course even in murky or GPS-denied waters. When it surfaces, it can transmit health and position data via radio or satellite, but the heavy survey data usually waits until recovery and direct download.

Sensors and data quality

The REMUS 300 can be fitted with high-resolution side-scan sonar that paints the seabed in detailed grayscale, letting operators spot cables, wreckage or mines against the sand. In good conditions the images look almost photographic, revealing shapes and shadows on the bottom.

Optional payloads like multibeam sonar build 3D bathymetric models, which hydrographers use to update nautical charts or plan subsea construction. Environmental sensors can measure temperature, salinity and currents, allowing scientific users to combine physical ocean data with precise maps of the seafloor.

Handling, logistics and crew workload

A key promise of the REMUS 300 is that small teams can handle it without cranes or large warships. The vehicle is meant to be carried by a pair of operators, loaded into a pickup or van, and deployed from modest boats or piers.

Mission planning happens via graphical software, where operators draw search patterns, set depth bands and configure sensors. That preparation takes time, but once the vehicle slips underwater, the crew can focus on monitoring rather than direct piloting, which reduces fatigue during long days at sea.

Strengths and where limits appear

Compared with older, heavier mine-hunting systems that need dedicated mother ships, the REMUS 300 offers a lighter, more agile approach with its man-portable form factor and flexible payload bay. For navies facing tight budgets, that combination of autonomy and portability is attractive.

However, endurance and speed remain constrained by its compact size and battery technology. For deep-ocean or multi-day survey missions, larger AUVs or towed systems still dominate, and rough surface conditions can complicate launch and recovery from small boats.

How HII frames the system

HII highlights the REMUS 300 as part of a broader shift toward unmanned and autonomous technologies alongside its traditional shipbuilding business, linking the vehicle to future distributed naval operations and persistent undersea sensing networks.

The company also points to interoperability with existing REMUS fleets, promising that navies already using earlier models can integrate the 300 into their logistics and training frameworks rather than starting from scratch with a completely new ecosystem.

Company background and stock reference

Huntington Ingalls Industries, headquartered in the United States, is best known as a builder of complex warships for the US Navy but has built a substantial segment around unmanned systems and defense technology services. Shares of Huntington Ingalls Industries (US44980X1090) trade on the New York Stock Exchange in US dollars.

This article was AI-assisted and editorially reviewed. Product information without guarantee; prices and availability may change at short notice. No investment advice, no buy or sell recommendation. Stock-market transactions involve risks up to total loss.

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