The REMUS (Remote Environmental Monitoring UnitS) series are autonomous underwater vehicles (AUVs) made by the Woods Hole Oceanographic Institution and designed by their Oceanographic Systems Lab (OSL). More recently REMUS vehicles have been manufactured by the spinoff company Hydroid Inc. a wholly owned subsidiary of Kongsberg Maritime.  The series are designed to be low cost and can be operated from a laptop computer. They are used by civilians for seafloor mapping, underwater surveying, and search and recovery as well as by several navies for mine countermeasures missions.
There are three variants of the REMUS, all are torpedo-shaped vessels with reconfigurable sensors.
The largest model is the REMUS 6000 at 3.84 metres (12.6 ft) long and 71 centimetres (28 in) in diameter; it is named after its maximum diving depth of 6000m. It can travel at speeds of up to 5 knots (9.3 km/h) and has an endurance of up to 22 hours.
The midsized REMUS 600 was previously known as the REMUS 12.75, so called due to its 12.75-inch (32.4 cm) diameter. It was renamed to the 600 to correspond to the maximum depth at which it can operate (600m). The US Navy derivative of this platform is designated Mk 18 Mod 2 “Kingfish."  The Mk 18 Mod 2 is equipped with side-scan sonar, a downward-looking video camera, ADCP, GPS, beam attenuation meter (BAM) to measure turbidity, and a conductivity temperature depth (CTD) sensor. It can travel at speeds of up to 5 knots (9.3 km/h) and has an endurance of up to 70 hours at its standard cruising speed of 3 knots (5.6 km/h).
The REMUS 100 is the smallest in diameter. The US Navy operates a derivative of the REMUS 100, in addition to the standard REMUS 100, designated Mk 18 Mod 1 “Swordfish”. It can travel at speeds of up to 5 knots (9.3 km/h) and has an endurance of up to 22 hours at its standard cruising speed of 3 knots (5.6 km/h).
REMUS units were used successfully in 2003 during Operation Iraqi Freedom to detect mines, and in 2011 during the fourth search for the missing aircraft "black boxes" from the crashed Air France flight AF447, which they successfully found. Three REMUS 6000 units were used in the AF447 search. In a video posted by Colombian president Juan Manuel Santos, a REMUS 6000 is seen being used by the Colombian Navy to examine the shipwreck, now patrimony, of galleon San José that sunk in 1708 off the coast of Cartagena de Indias.
In 2012, the mine detection-variant of the REMUS 600 was deployed by the US Navy to the 5th Fleet, operating primarily in the Persian Gulf. REMUS vehicles in Navy service are generally deployed from 11-metre (36 ft) rigid hull inflatable boats, which can carry two vehicles, although they have been deployed from littoral combat ship USS Freedom and from an MH-60S Seahawk helicopter in exercises. In 2018, a US Navy REMUS 600 named “Smokey” was captured by Houthi combat divers off the coast of Yemen; the Houthi forces published a video of the captured vehicle.
In 2017 a REMUS 6000 operated from the billionaire Paul Allen’s research vessel R/V Petrel helped discover the USS Indianapolis (CA-35) at 5,500m in the Philippine Sea. In 2018 a REMUS 6000 operated from R/V Petrel discovered the wreck of the USS Lexington (CV-2) in the Western Pacific, the USS Lexington was sunk in 1942 during the Battle of the Coral Sea.
- United States Navy
- Woods Hole Oceanographic Institute
- Naval Oceanographic Office
- University of Hawaii at Manoa
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The ship carried three Remus 6000 submarines, some of the most advanced underwater search vehicles on earth, which swept the seafloor in 20-hour runs.
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