Lübeck and Rostock, Germany – July 14^th, 2026 – GABLER, a leading provider of submarine systems, and German defence technology company FLANQ have successfully completed the Sea Acceptance Test (SAT) demonstrating seaworthiness of their jointly developed Torpedo-Tube-Launched Uncrewed Surface Vessel (TTL USV) capability demonstrator.

The demonstrator vehicle, named Ranger, combines GABLER’s decades of expertise in mission-critical submarine components and defence manufacturing with FLANQ’s capabilities in autonomous maritime systems, mission software, AI-enabled autonomy and open capability architectures.

Launched from a standard 21-inch submarine torpedo tube, the Ranger TTL USV is designed to autonomously surface and undertake covert intelligence, surveillance and reconnaissance missions. The 4.5-metre platform features a folding keel and sensor mast, electric drivetrain and a mission-configurable payload bay. A one-way-attack (OWA) variant, Strike, will also be available. GABLER is leading the programme’s commercialisation, delivery to naval customers and host platform integration.

June’s Sea Acceptance Test validated the integration and operation of the vehicle’s key technologies, with performance data recorded and verified throughout the trials. Completion of this Proof-of-Concept phase marks a significant milestone in the strategic collaboration between GABLER and FLANQ as development progresses towards delivering operational capability to end-users.

Marine autonomous systems like Ranger and Raider are seen as cornerstone of future hybrid naval operations. The ability to rapidly deploy uncrewed, attritable systems from exquisite platforms such as submarines and ships significantly expands operational flexibility, reduces risk to personnel and enables entirely new mission concepts for intelligence, surveillance, force protection and other maritime defence applications.

The GABLER and FLANQ trials team gathered in Rostock, Germany. GABLER’s Felix David pictured centre with FLANQ’s Jannik Sauer to his left.

“Successfully completing the SAT marks another important milestone in the development of our TTL USV programme. The tests confirmed the maturity of the vehicle at this stage of development while demonstrating the excellent progress achieved by the joint team,” said Felix David, TTL USV Project Lead at GABLER.

“FLANQ’s strength lies in developing new and novel operational capabilities for European defence at pace. Together with our partner GABLER, we’re combining commercial-off-the-shelf technologies and operational know-how to create solutions aligned to future maritime missions. June’s successful SAT shows how conventional naval platforms, and next-generation autonomy can be brought together to create entirely new capabilities for domain advantage,” said Jannik Sauer, Chief Technology Officer, FLANQ.