The REMUS 300 is a new, small-class unmanned underwater vehicle (UUV) built for military and commercial applications. With improved modularity and maximum payload flexibility, the vehicle is one of the most advanced UUVs in the market.

The two-man portable vehicle is manufactured by US-based underwater technology company Hydroid, a subsidiary of shipbuilding firm Huntington Ingalls Industries (HII). HII acquired Hydroid from Norwegian aerospace and defence company Kongsberg for $350m in March 2020.

The REMUS 300 vehicle, which is the latest in the REMUS family of autonomous vehicles, was designed and developed as a commercial product.

The primary applications of the REMUS 300 UUV are mine countermeasures (MCM), search and recovery (SAR), rapid environmental assessment (REA), hydrographic survey, renewables, marine archaeology, offshore oil and gas, anti-submarine warfare (ASW) and intelligence, surveillance and reconnaissance (ISR).

Hydroid sold more than 500 REMUS UUVs to 25 countries around the world. The commercial availability of the standard REMUS 300 model was announced in April 2021, with deliveries planned in 2022.

REMUS 300 UUV orders and deliveries

Hydroid delivered the first REMUS 300 UUV prototype to the US Navy in February 2020, as part of a prototype project agreement with the US Department of Defense’s (DoD) Defense Innovation Unit (DIU).

Hydroid and the US Navy are working on delivering spiral modifications to the commercial REMUS 300 for increased military capabilities.

The REMUS 300 prototype is being assessed by the Naval Information Warfare Center (NIWC) to study its potential as a solution for the US Navy’s next-generation small-class UUV (SUUV) programme.

REMUS 300 UUV design and features

The REMUS 300 was designed in compliance with the US Navy’s Modular Open Systems Architecture (MOSA) and Unmanned Maritime Autonomy Architecture (UMAA) specifications. It incorporates design improvements from the REMUS 100 autonomous underwater vehicle.

The standard REMUS 300 weighs 56kg, while its length and diameter are 2.3m and 19cm, respectively. The vehicle’s modularity allows it to be reconfigured for various missions, ranging from a 45.35kg expeditionary configuration to a 67.58kg long-endurance configuration.

The REMUS 300 retains the already trusted REMUS 100’s hull design, with certain improvements which will enable the vehicle to dive up to a maximum depth of 305m (1,000ft).

The UUV has advanced features such as a more robust structure and sensors, data distribution system (DDS), open architecture, flexible energy options, a new HyFleet graphic user interface with simulator and a removable 1TB solid-state hard drive.

The improved design allows for increased capabilities, interoperability and a range of applications at a reduced cost. The open architecture is designed to enable rapid integration of the latest modules and software, as well as allow future upgrades based on mission requirements.

HyFleet provides automatic mission validation and drag-and-drop functionality to facilitate quick mission planning, while also enabling simultaneous monitoring of multiple vehicles.

The next generation REMUS 300 is incorporated with the REMUS technology platform, which features efficient core electronics and is scalable across all vehicle classes. It has advanced autonomy and a shared operating system that enables interoperability with the entire REMUS family of systems.

Payloads and sensors

The REMUS 300 is available in small and large payload configurations to meet customer requirements. It allows the addition of a payload to collect additional information.

The UUV can be equipped with a suite of sensors and payloads to support a range of mission requirements. The improved design supports the integration of new payloads, sensors and algorithms.

The underwater vehicle can be equipped with a vehicle interface programme (VIP) to provide mission programming and post-mission analysis capabilities.

Sensors aboard the vehicle include a Marine Sonics MK II Arc Scout 900/1800kHz dual frequency side scan sonar with a resolution of up to 5cm and swath width of up to 160m, NBOSI conductivity and temperature (CT) sensor, and TE Connectivity depth sensor.

A software development kit (SDK) and hardware development kit (HDK) are being developed to enable the integration of third-party payloads and autonomy. Optional payloads and sensors include a 2G Robotics 4K HD stills camera module with high intensity LED lightbar, Seabird Scientific Eco Puck Triplet environmental sensor and Klein MA-X gap-filling sonar.

Navigation and communications

The navigation equipment installed aboard the REMUS 300 includes iXblue Phins C3 inertial navigation system (INS), long baseline (LBL), Garmin commercial or optional GB-Gram military global positioning system (GPS) and doppler-assisted dead reckoning.

The UUV uses Woods Hole Oceanographic Institution (WHOI) micromodem 2.0 acoustic communications for underwater communication. Other communication systems include Wi-Fi and an optional Iridium system for communication through satellite.

Propulsion and performance of REMUS 300

The unmanned vehicle is powered by a direct-drive DC brushless motor coupled to an open three-blade propeller. The control system includes a Cruciform fin for yaw and pitch control.

The REMUS 300 can be configured with 1.5kWh, 3kWh or 4.5kWh lithium-ion batteries with an endurance of up to ten, 20 or 30 hours and recharge time of six, 12 or 18 hours, respectively. The blind-mated end caps fulfil the requirements of IP-X4 standards, allowing for rapid battery exchanges on the field during missions.

The vehicle is capable of diving to depths of up to 305m and achieving speeds up to 5k. The standard variant has a maximum range of 110km, while the long-endurance version has a maximum range of 165km.

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