Quantum Systems Subvex

History

Quantum Systems Subvex is an AI-enabled unmanned underwater vehicle developed for autonomous intelligence, surveillance and reconnaissance missions. The system is intended to operate at depths of up to 6,000 m and can perform active missions or remain on the seabed for passive monitoring.

Subvex was introduced together with the Seavex unmanned surface vehicle as part of Quantum Systems' expansion into maritime unmanned systems. Both platforms are integrated with the MOSAIC UXS software architecture, allowing information from air, land, surface and underwater systems to be combined within a common operational environment.

The vehicle is intended for missions including critical maritime infrastructure protection, maritime border security, anti-submarine surveillance and blue-water surveillance. Quantum Systems describes the platform as capable of distributed operations involving multiple Subvex vehicles.

Quantum Systems publicly introduced Subvex and Seavex at Sesimbra, Portugal, on 14 September 2026, on the sidelines of a NATO maritime exercise. According to the Quantum Systems announcement, the two systems were being tested and validated during sea trials rather than presented as established operational equipment.

The maritime program extended the company's unmanned-system activities from air and land into the sea domain. Quantum Systems designed Subvex and Seavex to operate through the same MOSAIC UXS architecture, with the objective of connecting sensors and autonomous platforms above and below the waterline.

Independent reporting published after the presentation also described Subvex as a deep-sea autonomous vehicle intended for reconnaissance, surveillance and infrastructure-protection missions. Militarnyi reported that the system can support distributed operations with multiple vehicles and remain on the seabed for prolonged passive monitoring.

Design

Underwater vehicle

Subvex is an unmanned underwater vehicle designed for autonomous missions in deep water. Its reported maximum operating depth is 6,000 m. The available information does not disclose its dimensions, mass, propulsion arrangement or maximum speed.

The vehicle is designed for two different endurance profiles. During active movement, it can operate for up to four days. For passive surveillance, it can remain on the seabed for several weeks, allowing persistent monitoring without continuous movement.

Sensors and processing

Subvex carries sonar and acoustic sensors for underwater detection and monitoring. It also uses onboard edge processing, allowing sensor information to be processed within the vehicle rather than relying entirely on an external control station.

Quantum Systems describes Subvex as AI-enabled. The system is designed to support autonomous intelligence, surveillance and reconnaissance missions and distributed operations involving several Subvex vehicles.

Network integration

Subvex is integrated into Quantum Systems' MOSAIC UXS architecture. The software environment is intended to combine information from multiple unmanned systems and sensors across air, land and maritime domains into a common operational picture.

Subvex is designed to operate alongside the Seavex unmanned surface vehicle. Quantum Systems states that Seavex can dock with underwater vehicles, recharge them and retrieve mission data, supporting extended maritime unmanned operations.

Program status

As of its September 2026 public introduction, Subvex was undergoing sea trials and capability validation in Portugal. Quantum Systems presented the vehicle as part of its newly launched maritime portfolio. The available sources do not establish that Subvex had entered serial production or operational service at that time.

The trials were conducted in connection with a NATO maritime exercise involving the Portuguese Navy and other participating organizations. The program was intended to demonstrate the integration of autonomous air, land, surface and underwater systems through MOSAIC UXS.

Specifications (Subvex)

General characteristics

• Type: AI-enabled unmanned underwater vehicle
• Maximum operating depth: up to 6,000 m
• Sensors: sonar and acoustic sensors
• Data processing: onboard edge processing
• Network architecture: MOSAIC UXS integration

Endurance

• Active movement: up to four days
• Passive seabed surveillance: several weeks

Mission roles

• Primary role: autonomous underwater intelligence, surveillance and reconnaissance
• Additional missions: critical maritime infrastructure protection, maritime border security, anti-submarine surveillance and blue-water surveillance
• Distributed operations: supports missions involving multiple Subvex vehicles

Related equipment

• Quantum Systems Seavex: an unmanned surface vehicle introduced alongside Subvex and integrated into the same MOSAIC UXS maritime architecture.