SOTIRIA Technology and Naval Group sign a memorandum at EURONAVAL on seabed warfare and infrastructure surveillance

The Greek company SOTIRIA Technology, which develops sensors and software for underwater surveillance, signed a strategic memorandum of understanding and cooperation with the French shipbuilding group Naval Group at the EURONAVAL international naval defence exhibition in Paris. The company announced the agreement on Wednesday, November 4 in a post on its website, explaining that the aim is to jointly promote naval defence and security technologies.

The signing took place at the Hellenic Pavilion organised by the Hellenic Defence Manufacturers Association (SEKPY), where 17 Greek companies are exhibiting this year. Attending, along with other institutional and industry representatives, were Naval Group CEO Pierre Pomelet, Tasos Rozolis as SEKPY president and, from the Greek state side, Ioannis Bouras, Director General of the General Directorate for Defence Investments and Armaments (GDDIA).

Research, field trials and integration

The memorandum covers three fields: joint research, trials in real conditions and the integration of the Greek company’s solutions into Naval Group systems. The two sides want to strengthen critical operational capabilities in areas such as seabed warfare and infrastructure surveillance. The two companies will also jointly pursue major defence and innovation programmes.

For Naval Group the agreement adds to an already dense network of Greek partnerships. The French group, which is building the Hellenic Navy’s FDI frigates, has said that more than 75 Greek companies take part in the FDI programmes and their support. Also in the spotlight at this year’s EURONAVAL was the French 2027 defence budget, with its emphasis on naval drones.

Acoustic and magnetic sensors for the seabed

SOTIRIA Technology is a member of the HASDIG group (Hellenic Aerospace Security & Defense Industries Group) and describes its work as developing AI-based detection equipment for national security applications. Nereid is a passive intelligence, surveillance and reconnaissance (ISR) system for the underwater environment. It consists of fixed arrays of Type S magnetic sensors and Type A passive hydrophones, while their data go into the Dioptre software, which uses AI algorithms to detect and classify threats.

The company presents Nereid as a solution for maritime borders, critical national installations and strategic straits, with an architecture that can be linked to Combat Information Centres (CIC). The Type S fluxgate magnetic sensor operates at picotesla-level sensitivity and, SOTIRIA says, can detect a 1,000-tonne ferromagnetic object within a radius of several hundred metres. These are the company’s own figures. The company’s underwater sensors had been tested in the “Parmenion 2025” exercise.