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Portuguese, U.S. Navies Team Up for World's Largest Maritime Robotics Exercise

REPMUS 2025 brought together U.S. and NATO partners for world-class maritime robotics training. Submarines from both nations tested unmanned systems for operational advantage.

This is a ship. In this there are poles, boxes, railings. And there are some people wearing...
This is a ship. In this there are poles, boxes, railings. And there are some people wearing helmets. In the back there is water.

Portuguese, U.S. Navies Team Up for World's Largest Maritime Robotics Exercise

The Portuguese-led Robotic Experimentation and Prototyping with Maritime Unmanned Systems (REPMUS) exercise recently concluded, focusing on the development and interoperability of maritime unmanned systems. The training highlighted the shared imperative of the U.S. and NATO partners to defend the seabed and critical undersea infrastructure.

The exercise involved the participation of the USS New Mexico (SSN 779) and the Portuguese submarine NRP Tridente (209PN), along with the frigate NRP Francisco de Almeida (F334) and patrol vessel NRP Setubal (P363). Notably, the USS New Mexico deployed a submarine-launched unmanned aerial system (UAS) in operational experimentation.

Commander Douglas Fox led the joint training exercises for anti-submarine warfare and operational testing. The exercises, part of NATO's Dynamic Messenger/REPMUS 2025, saw submarines from the U.S. and Portuguese navies conducting joint ASW training. NATO described these activities as embodying innovation and demonstrating the integration of submarines with unmanned platforms for operational advantage.

The Portuguese submarine NRP Tridente operated alongside the USS New Mexico during the largest NATO/Portugal maritime robotics exercise in the world, Dynamic Messenger/REPMUS. Both exercises aimed to deliver unmanned systems and capabilities into Allied naval forces with speed and scale, further enhancing their operational capabilities.

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