Quantum Systems is going to sea. The German autonomous-systems company has unveiled Seavex and Subvex, its first dedicated maritime systems, expanding its portfolio from aerial and ground autonomy into surface and underwater operations.
Announced on September 14, 2026, in Sesimbra, Portugal, the two platforms are designed to connect maritime surveillance above and below the waterline through the company's MOSAIC UXS software architecture. Both systems are now entering sea trials, making this a major industry development—but also one that still needs real-world validation.
The significance goes beyond the two vehicles themselves. Quantum Systems is trying to make air, land, surface and underwater assets part of one interoperable autonomous ecosystem. That direction builds directly on the wider evolution of autonomous drones, AI, BVLOS and Drone-in-a-Box systems, where the software layer increasingly matters as much as the individual aircraft.
MidronePro Take: Seavex and Subvex are important because Quantum Systems is moving from an aerial-drone company toward a broader multi-domain autonomous-systems architecture. Seavex is designed as the maritime mission hub, while Subvex extends sensing beneath the waterline. The real story is MOSAIC UXS connecting those platforms with aerial and ground systems.
However, these systems are entering sea trials, so we should distinguish published capability from demonstrated operational performance. The next important evidence will come from trials, integration results, customer deployments and proof that the complete system-of-systems architecture works reliably in real maritime environments.
Table of Contents
- What Happened?
- What Is Seavex?
- What Is Subvex?
- Seavex vs Subvex
- Why MOSAIC UXS Is the Bigger Story
- From Drone Company to Multi-Domain Autonomy Company
- What Missions Are They Designed For?
- Seavex as a Maritime Autonomous Hub
- Why Subvex's 6,000-Metre Depth Matters
- Sea Trials Are the Next Test
- Why This Matters for the Drone Industry
- What We Still Don't Know
- What MidronePro Will Be Watching
- MidronePro Verdict
- Learn More at MidronePro Academy
- FAQ
What Happened?
Quantum Systems announced its maritime expansion on September 14, 2026, introducing Seavex and Subvex as the company's first dedicated maritime systems.
The announcement was made in Sesimbra, Portugal, alongside a NATO maritime exercise involving the Portuguese Navy, FEUP, NATO CMRE, NATO JCGMUS and the European Defence Agency.
Quantum Systems says both systems will undergo sea trials to test and validate their capabilities in an operational environment. That makes the announcement significant, but it also means readers should not treat every published specification as equivalent to an independently demonstrated operational result.
The company describes the two platforms as complementary:
- Seavex operates on the surface as a long-endurance autonomous maritime mission hub.
- Subvex operates underwater as an autonomous intelligence and sensing node.
- MOSAIC UXS connects them with other autonomous systems and sensors through a common software architecture.
Quantum Systems says the architecture is intended to connect autonomous operations across air, land and sea, creating a shared operational picture rather than isolated platform-specific missions.
What Is Seavex?
Seavex is an unmanned surface vehicle (USV) designed to act as the operational center of autonomous maritime missions.
Quantum Systems positions it as more than a conventional autonomous boat. The platform combines long endurance, sensing, communications, mission execution and support functions for other unmanned systems.
| Specification | Seavex |
|---|---|
| Platform | Unmanned Surface Vehicle (USV) |
| Endurance | Up to 2 months |
| Surveillance speed | 3 knots |
| Maximum speed | 15 knots |
| Payload | Up to 400 kg |
| Displacement | 4,500 kg |
| Dimensions | 8.5 × 6.5 m; 1.8 m draft |
| Operating sea state | Up to Sea State 3 |
| Survivability | Up to Sea State 6 |
| Communications | SATCOM, 5G, Wi-Fi and Silvus |
| Data encryption | AES-256 |
Its headline specification is endurance: Quantum Systems states that Seavex can operate for up to two months.
The platform also has a stated payload capacity of up to 400 kg and a maximum speed of 15 knots. For persistent surveillance, the company specifies a 3-knot surveillance speed.
Seavex sensor architecture
Quantum Systems lists a medium-range multi-sensor electro-optical tracker with laser rangefinding, an anti-drone 4D radar, a 2D surveillance radar, color and FLIR cameras and visual odometry.
The company specifies a 15-nautical-mile multi-mission counter-drone radar and a 48-nautical-mile surveillance radar.
That combination gives Seavex a role that extends beyond simple maritime observation into a broader surveillance and Counter-UAS architecture.
What Is Subvex?
Subvex is an unmanned underwater vehicle (UUV) designed to provide an underwater intelligence layer for autonomous maritime operations.
The technical challenge is fundamentally different from aerial or surface autonomy. Underwater systems have to operate in an environment where conventional radio connectivity is severely constrained and GNSS is unavailable below the surface.
Quantum Systems therefore emphasizes onboard processing, sonar, hydroacoustic sensing and autonomous navigation.
| Specification | Subvex |
|---|---|
| Platform | Unmanned Underwater Vehicle (UUV) |
| Active endurance | Up to 4 days |
| Maximum speed | 8 knots |
| Surveillance speed | 3 knots |
| Payload | Up to 20 kg |
| Weight | 400 kg |
| Length | 4.2 m |
| Diameter | 533 mm |
| Operating depth | Up to 6,000 m |
| Battery capacity | 42 kWh |
| Data encryption | AES-256 |
| Communications | USBL, Wi-Fi, inductive, Silvus, 5G and Iridium |
Quantum Systems says Subvex can operate for up to four days in active movement and can remain on the seabed in passive surveillance mode for weeks.
That distinction is important. Subvex is not being presented simply as a fast underwater vehicle. Its concept is built around persistent sensing, including the ability to remain in place and continue monitoring.
Subvex sensors
The published architecture includes USBL navigation and modem capability, a Doppler velocity log, side-scan sonar, a hydrophone array and forward-imaging sonar.
Quantum Systems also describes Subvex as an AI-enabled platform with onboard edge processing, allowing sensor information to be processed closer to the vehicle rather than depending entirely on a continuous surface connection.
Seavex vs Subvex
| Category | Seavex | Subvex |
|---|---|---|
| Domain | Surface | Underwater |
| Platform | USV | UUV |
| Primary role | Maritime mission hub | Underwater intelligence node |
| Endurance | Up to 2 months | Up to 4 days active; weeks in passive mode |
| Maximum speed | 15 knots | 8 knots |
| Payload | Up to 400 kg | Up to 20 kg |
| Operating depth | Surface platform | Up to 6,000 m |
| Primary sensing | Radar, EO/IR, FLIR and visual systems | Sonar, hydroacoustic sensing and DVL |
| System role | Hub, support and surface sensing | Distributed subsea sensing |
The two systems are complementary rather than direct competitors.
Seavex provides the surface infrastructure. Subvex extends the sensing network below the waterline. The software layer is what is intended to turn those separate capabilities into one operational system.
Why MOSAIC UXS Is the Bigger Story
The most consequential part of the announcement may actually be MOSAIC UXS.
Quantum Systems describes MOSAIC UXS as the software architecture that connects autonomous systems, sensors and operators across multiple domains. Its current maritime architecture brings together aerial, surface and underwater assets into a common operational environment.
The company describes AI-powered mission orchestration, sensor fusion, decision support and human-in-the-loop control as central elements of the architecture.
This is important because autonomous fleets increasingly depend on software to coordinate different systems. The vehicle is only one component; the operational value can come from how information moves between vehicles, sensors and human operators.
That is also why the company's maritime announcement should be read alongside the broader evolution of autonomous drone fleet software.
The same underlying principle applies: the industry is moving from one pilot controlling one aircraft toward increasingly connected fleets managed through software.
From Drone Company to Multi-Domain Autonomy Company
Quantum Systems started with aerial autonomous systems and has expanded its portfolio into ground and software capabilities. Seavex and Subvex extend that strategy into maritime operations.
The company's upgraded RELIANT system is already being integrated into the MOSAIC UXS ecosystem, showing that the software architecture is intended to span multiple unmanned platforms rather than remain tied to one aircraft.
The resulting direction can be summarized as:
Air → land → surface → underwater → one software architecture.
This does not mean every mission will require every platform. It means the architecture is being designed so that different assets can contribute different capabilities to a shared operational picture.
That model is becoming increasingly visible across autonomous robotics.
Our coverage of drone swarm technology explores a similar transition in the aerial domain, where the emphasis moves from individual aircraft toward coordinated groups of autonomous systems.
What Missions Are They Designed For?
Quantum Systems identifies several mission categories for the maritime architecture.
Persistent maritime surveillance
Seavex is designed to provide long-duration maritime intelligence, surveillance and reconnaissance. Its endurance allows the platform to remain deployed for much longer periods than a conventional crewed patrol approach.
Critical infrastructure protection
The company specifically identifies critical maritime infrastructure as an application area, including subsea infrastructure that cannot be adequately monitored from the surface alone.
Subvex extends sensing beneath the waterline while Seavex can provide surface awareness and support.
Maritime border security
Surface and underwater sensing can contribute different information to a maritime security picture, helping operators understand vessel activity and conditions across multiple layers of the environment.
Anti-submarine surveillance
Subvex's sonar and hydroacoustic sensing architecture is designed for underwater intelligence missions, including monitoring and characterizing underwater activity.
Counter-UAS operations
Seavex can also be configured for Counter-UAS missions. Quantum Systems describes integrated radar-based detection and interceptor-launch capabilities as part of its active-protection configuration.
This gives the platform a broader role than conventional maritime surveillance, although real-world effectiveness will ultimately depend on testing and operational integration.
Seavex as a Maritime Autonomous Hub
One of the most distinctive aspects of Seavex is its ability to support other unmanned systems.
Quantum Systems says the platform can launch and recover UAVs while also docking with Subvex, recharging underwater vehicles and retrieving mission data.
That effectively turns Seavex into a floating autonomous support station.
The concept resembles a maritime version of the persistent infrastructure seen in Drone-in-a-Box systems: the autonomous vehicle is supported by an infrastructure layer that extends mission endurance, communications and remote operation.
The difference is that Seavex is designed to move through the maritime environment while supporting assets operating above and below it.
That makes the platform potentially valuable as a node within a distributed autonomous network rather than simply as a standalone USV.
Why Subvex's 6,000-Metre Depth Matters
Quantum Systems specifies an operating depth of up to 6,000 metres for Subvex.
That is a technically demanding environment. Pressure rises dramatically with depth, satellite navigation is unavailable underwater, and conventional high-bandwidth communications cannot simply follow a submerged vehicle.
Consequently, underwater autonomy requires a different combination of navigation, sensing, onboard processing and mission planning from aerial systems.
Subvex's sonar and acoustic architecture is therefore central to its concept. The vehicle is designed to collect information where surface-based sensors and aerial drones cannot directly observe.
The bigger idea is persistent underwater intelligence: a vehicle that can move autonomously, collect sensor data and potentially remain on the seabed in passive monitoring mode.
Sea Trials Are the Next Test
Quantum Systems says Seavex and Subvex are entering sea trials to test and validate their capabilities in an operational environment.
This is where the announcement will become much more meaningful.
Maritime autonomy is difficult to evaluate from specifications alone. Real-world performance depends on:
- Sea state and weather
- Navigation accuracy
- Communications availability
- Sensor performance
- Energy management
- Autonomous mission execution
- UAV launch and recovery
- Underwater docking and recharging
- Cross-domain data fusion
- Human supervision and intervention
A platform can have impressive specifications while the complete system still encounters integration problems. The sea trials should therefore provide important evidence about whether Quantum Systems' system-of-systems approach works reliably outside demonstrations.
Why This Matters for the Drone Industry
Seavex and Subvex are not consumer drones, but they are highly relevant to the broader drone industry because they illustrate where autonomous technology is heading.
The traditional drone model is aircraft-centric:
Aircraft → controller → camera → flight.
The emerging autonomous model is increasingly system-centric:
Sensors → autonomy → communications → software → fleet → data → human decision.
That transition is already visible in autonomous inspection and persistent remote operations. MidronePro's AI Drone Inspection guide covers the same broader movement from manually flown aircraft toward systems that can collect and interpret infrastructure data with increasing automation.
Quantum Systems is taking that philosophy into an environment where the operational problem is even more complex because three physical domains have to be connected.
What We Still Don't Know
How mature are the systems?
The platforms are entering sea trials. The announcement does not establish broad production deployment or operational acceptance.
How much autonomy remains human-supervised?
Quantum Systems emphasizes AI-powered mission orchestration and human-in-the-loop control. The precise division between autonomous execution and human intervention will be important to understand as trials progress.
How well does cross-domain sensor fusion work?
Connecting different sensor feeds is relatively straightforward compared with turning them into a reliable common operational picture. The quality, latency and usability of that fusion will be important measures of the MOSAIC UXS architecture.
How scalable is the architecture?
Quantum Systems presents Seavex and Subvex as part of a scalable system-of-systems approach. The real test will be whether multiple vehicles and different types of autonomous systems can operate together without creating additional complexity for human operators.
When will wider customer deployments begin?
The September 2026 announcement focuses on launch and sea trials. Further information about production quantities, customer deployments and broader operational adoption remains to be established.
What MidronePro Will Be Watching
| Development | Why It Matters |
|---|---|
| Sea-trial results | The first meaningful evidence of real-world maritime performance. |
| MOSAIC UXS integration | Shows whether air, land, surface and underwater systems can actually operate as one architecture. |
| Subvex underwater autonomy | Deep-water autonomous navigation and sensing are substantially different from aerial operations. |
| Seavex UAV operations | Launch, recovery, charging and data transfer could make Seavex a genuine maritime autonomy hub. |
| Fleet scaling | Multiple coordinated platforms will provide a stronger test of the system-of-systems concept. |
| Customer adoption | Operational deployments will provide a stronger maturity signal than specifications alone. |
The broader autonomous-drone market is also moving toward persistent and connected fleets. Our 5G autonomous BVLOS analysis examines how communications infrastructure can become part of the autonomy stack rather than simply a transmission link.
MidronePro Verdict
Quantum Systems' Seavex and Subvex announcement deserves high industry-news priority.
Not because the company has produced two more unmanned vehicles, but because it is extending a common autonomy architecture from the air and land into surface and subsea operations.
Seavex is the maritime mission hub. Subvex is the underwater intelligence node. MOSAIC UXS is the software layer intended to connect them with other autonomous assets.
That architecture is the real story.
At the same time, the timing matters. Both systems are entering sea trials, so it is too early to treat the published capabilities as equivalent to proven operational performance.
If the trials demonstrate reliable multi-domain coordination, autonomous UAV launch and recovery, underwater docking, persistent sensing and effective human-supervised mission orchestration, Quantum Systems will have moved considerably beyond the traditional definition of a drone manufacturer.
For MidronePro, the development belongs in the same larger technology story as autonomous fleets, BVLOS, Drone-in-a-Box infrastructure, AI inspection and swarm systems.
The industry is increasingly moving from individual drones toward connected autonomous systems. Seavex and Subvex are one of the clearest 2026 examples of that shift extending beyond the air.
Learn More at MidronePro Academy
Explore the wider autonomous-drone technologies that help put the Quantum Systems announcement into context:
- Detect and Avoid Technology for BVLOS — Explore the sensing and safety technologies required as autonomous operations become more capable.
- BVLOS Drone Operations in 2026 — Learn how remote and autonomous operations are changing professional drone missions.
- SORA 2.5 Explained — Understand how structured risk assessment supports complex European drone operations.
- STS-02 BVLOS in Europe — Explore the European regulatory framework around standardized BVLOS operations.
- U-Space Explained in Europe — See how digital airspace services can support increasingly connected drone operations.
- Percepto Autonomous Drones Review 2026 — Examine a real-world industrial autonomous-drone ecosystem built around persistent remote operations.
Frequently Asked Questions
What are Quantum Systems Seavex and Subvex?
Seavex and Subvex are Quantum Systems' first dedicated maritime autonomous systems. Seavex is an unmanned surface vehicle designed as a maritime mission hub, while Subvex is an unmanned underwater vehicle designed for autonomous subsea intelligence and surveillance.
What is Seavex designed to do?
Seavex is designed for persistent maritime intelligence, surveillance and reconnaissance, critical infrastructure protection and Counter-UAS missions. It can also support other unmanned systems through UAV launch and recovery and Subvex docking capabilities.
How long can Seavex operate?
Quantum Systems specifies endurance of up to two months for Seavex.
How deep can Subvex operate?
Quantum Systems specifies an operating depth of up to 6,000 metres for Subvex.
How long can Subvex operate underwater?
Subvex is specified for up to four days of active movement and can remain on the seabed in passive surveillance mode for weeks, according to Quantum Systems.
What is MOSAIC UXS?
MOSAIC UXS is Quantum Systems' software architecture for connecting autonomous systems, sensors and operators across air, land and maritime domains. It is intended to provide a common operational environment and support AI-assisted mission orchestration and sensor fusion.
Are Seavex and Subvex drones?
They are autonomous unmanned systems, but they are not conventional aerial drones. Seavex is a USV, or unmanned surface vehicle, while Subvex is a UUV, or unmanned underwater vehicle.
Can Seavex launch drones?
Yes. Quantum Systems says Seavex includes autonomous UAV launch and recovery capabilities.
Can Seavex support Subvex?
Yes. Quantum Systems says Seavex can dock with Subvex, recharge underwater vehicles and retrieve mission data.
What sensors does Subvex use?
Quantum Systems lists USBL navigation and modem capability, a Doppler velocity log, side-scan sonar, a hydrophone array and forward-imaging sonar.
What missions are Seavex and Subvex intended for?
Quantum Systems identifies persistent maritime surveillance, critical infrastructure protection, maritime border security, anti-submarine surveillance, blue-water surveillance and Counter-UAS operations among the intended mission areas.
Are Seavex and Subvex already operational?
Quantum Systems says both systems are entering sea trials to test and validate their capabilities in an operational environment. Broader operational deployment and maturity therefore remain to be established.
Why is the Quantum Systems maritime expansion important?
The importance extends beyond the two platforms. Quantum Systems is attempting to connect autonomous air, land, surface and underwater systems through a common software architecture, representing a broader shift toward multi-domain autonomous systems.
