Own the water
column, end to end.
RTsys builds the underwater-acoustic systems that let navies, coast guards and EOD dive teams find, classify and neutralise the sea-mine threat — and train hard for the submarine one — without a dedicated mine-hunter or a live submarine on station. Man-portable. Two-operator. In service with allied navies today.
One specialist. Two underwater battlespaces.
RTsys builds everything around underwater acoustics — the one medium that carries through seawater where light and radio cannot. That single competence reaches across two defence missions: clearing mines and ordnance with divers and autonomous vehicles, and giving navies a realistic submarine threat to check, train against and measure. SepcoTech brings the full RTsys portfolio to navies, coast guards, EOD and police dive units as a single, supported package — specified, supplied and backed through life.
The cheapest weapon at sea can close a sea lane for years.
A handful of moored contact mines or seabed influence mines can shut a strait, a port approach or an amphibious objective — and hold it shut long after the shooting stops. The threat is both inherited and renewed: legacy ordnance from past conflicts still litters European shorelines, while a new generation of influence mines adds AI-boosted sensors that are harder to trigger and harder to fool.
The Black Sea and North Sea already face post-conflict clearance tasks measured in years. Chokepoints like the Strait of Hormuz remain acutely vulnerable. Yet mine warfare has historically been under-funded against flashier programmes — leaving many forces short of the kit to answer the threat quickly.
- Moored, bottom & drifting mines — plus decades of unexploded ordnance (UXO)
- Influence mines with AI-enhanced sensitivity, harder to sweep
- Q-routes, port approaches and beach objectives that must be proven clear
- Constabulary tasks: harbour force-protection, EEZ security, UXO on the coast
Choose your mission
Each pillar is a complete capability area with its own systems — explore the suite that matches your task.
Mine Counter-Measures
A manned-and-unmanned MCM suite linked by underwater acoustics: diver-held sonar, MCM AUVs, surface coordination and acoustic firing — so detection, classification, localisation and neutralisation run as one coordinated picture, with the diver kept out of the blast radius for as long as possible.
Explore MCM systems →
Anti-Submarine Warfare
Check, train and analyze — without tying up a real submarine. A mobile training target that recreates a submarine's acoustic signature for ASW exercises and torpedo firings, plus an acoustic-signature measurement range for validating sonar systems and characterising platforms.
Explore ASW systems →Four systems. One acoustic battlespace.
Diver, vehicle, surface station and firing device are linked by underwater acoustics — positioning, communicating and backing each other up across one mine-warfare environment.
SONADIVE
Diver-held sonar, navigation and acoustic comms — a full mine-hunting console in the diver's hands, with the lowest magnetism on the market and French Navy approval.
Explore SONADIVE →AUV COMET-MCM
Man-portable autonomous vehicle that surveys ahead of the diver with side-scan sonar, runs in swarm mode and doubles as a positioning beacon or acoustic relay.
Explore the COMET-MCM →
Surface Communication Module
The topside hub: a hydrophone-linked surface station that tracks divers and vehicles and gives the supervisor one coordinated picture.
Explore the SCM →
SONABLOW
Underwater acoustic firing device — replaces fragile electric firing lines with acoustic command, fired from the surface at any time.
Explore SONABLOW →Assess. Classify. Neutralise. Coordinate.
RTsys mirrors the MCM kill chain in one acoustic environment — pushing the unmanned system forward first and keeping the diver clear of the charge for as long as the task allows.
Assess
A man-portable AUV runs a rapid wide-area side-scan survey of the box or Q-route — no minehunter needed. Contacts are logged, geolocated and prioritised before a diver ever enters the water.
Classify
The diver goes only to the contacts that matter, navigating and identifying the object on a helmet-free 12″ sonar console — even in the zero-visibility water where cameras are useless.
Neutralise
An acoustic firing device places and fires the charge on command from the surface — replacing fragile electric firing lines and letting the team stand off at a safe distance.
Coordinate
Topside, the surface station tracks every diver and vehicle on one hydrophone-linked picture, passing contacts and text in real time out to 2 km — 5 km via relay beacons.
Check. Train. Analyze.
A realistic submarine threat and a measurement range — so navies can prepare crews and validate systems without a real submarine on station.
SEMA Training Target
A mobile or static acoustic target that recreates a submarine's signature, so ASW crews can train and run torpedo-firing exercises against a realistic threat — no live submarine required.
Explore SEMA →
Sonar & Signature Measurement
An acoustic-signature and sonar measurement range (SIERA) for validating sonar performance and characterising the acoustic signature of platforms under controlled conditions.
Explore the measurement range →What the mission looks like in the water
The same acoustic backbone answers the tasks a maritime force actually gets handed — from a mined harbour to an ASW work-up.
Prove a Q-route or port approach clear
Push an AUV ahead to sweep the transit box with side-scan, geolocate every contact, then send divers only to the objects that warrant a look — reopening the sea lane faster and with fewer people in the water.
Identify a bottom object in zero visibility
In silty, black-water harbours where cameras see nothing, the diver navigates and images the contact on a hand-held multibeam console — confirming mine, UXO or debris before committing a charge.
Neutralise ordnance with the team stood off
Place the charge, then fire it acoustically from the surface at the moment of choosing — no fragile firing line trailing back to the diver, and the whole team clear of the blast radius.
Search a hull, quay or harbour bed
Coast-guard and port-security dive teams sweep piers, pilings and ship bottoms for limpets, IEDs or contraband, and run search-and-recovery for weapons, evidence or missing persons in low-viz water.
Train a sonar crew — no submarine needed
Launch a recoverable target that mimics a submarine's acoustic signature and evasive behaviour, giving frigate and helicopter crews a repeatable threat to detect, track and fire torpedo exercises against.
Measure a signature, validate a sonar
Characterise the radiated acoustic signature of a platform, or validate the performance of a sonar system, under controlled conditions on a measurement range before it goes to sea.
Built for the people at the sharp end
RTsys systems are fielded across the maritime force — from blue-water navies to constabulary and homeland-security dive teams.
Navy MCM & Clearance Divers
Mine-hunting, route survey and ordnance disposal for surface flotillas and dedicated MCM forces.
EOD & Special Forces
Explosive ordnance disposal teams and special forces needing covert navigation and identification underwater.
Coast Guard & Port Security
Harbour force-protection, hull and quay search and littoral UXO tasks — without a dedicated mine-hunter.
Coast guard capability →Police & Homeland Security
Federal and regional police dive units for search-and-recovery, evidence and missing-person operations.
Police & EOD capability →Built to deploy where the threat is
From RHIBs and austere shorelines to a frigate's quarterdeck, RTsys systems are sized for two operators and no crane — every item under 45 kg — so a force can survey, classify, neutralise, train or measure without a dedicated mine-hunter or submarine on station.
In service with allied navies
RTsys MCM and ASW systems are on programme and in the water with naval forces across NATO and beyond — not concepts, but delivered contracts.
French Navy — SEMA MK-II
The Marine Nationale took delivery of the MK-II generation of the SEMA recoverable ASW training target, operating a fleet of the systems for crew training and torpedo-firing exercises.
Netherlands & Belgium — 7× SEMA
A binational order for seven SEMA targets — four for the Royal Netherlands Navy and three for the Belgian Navy — supporting the partners' shared ASW training requirement.
Slovenian Navy — MCM AUVs
Delivery of one COMET-MCM two-man-portable AUV plus two NemoSens micro-AUVs for mine detection, classification and localisation in the northern Adriatic.
Indian Navy — 2× SIERA
Two SIERA sonar & acoustic-signature measurement systems supplied through Bharat Electronics for platform characterisation and sonar validation.
DGA — French Procurement
Work with France's Direction Générale de l'Armement, the national defence-procurement agency, underpinning RTsys' standing as a qualified naval supplier.
New Factory, Higher Cadence
A new production facility opened in early 2026, increasing capacity and shortening lead times to meet the post-Ukraine surge in mine-warfare demand.
A safe pair of hands for defence at sea
Authorised Distributor
We represent RTsys directly — specification, supply and through-life support, coordinated from Denmark.
Naval & EOD Focus
A portfolio assembled for navies, coast guards and EOD units — not adapted from civilian kit.
One Point of Contact
Multi-supplier defence systems, integrated and quoted as a single package by one partner.
Backed Through Life
Training, spares and support for the full operational life of the system.
Speak directly with our defence specialist
Every enquiry is handled directly and in confidence — you will normally have a reply within one business day.
For spec sheets, capability documents, pricing or to arrange a briefing or demonstration — on this system or any platform in the SepcoTech defence portfolio — contact me directly:
- Spec sheets & technical datasheets on request
- Briefings & demonstrations for units & agencies
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