Unclassified // open-source data on European defence tech
Maritime
17 companies

Maritime startups in Europe

Uncrewed surface and underwater vessels, sensors and autonomy for patrol, mine countermeasures and the protection of undersea cables and pipelines, a priority for Europe since the Baltic Sea incidents.

Autonomous reconnaissance craft in the Baltic Sea, BALTOPS 2025. Photo: U.S. Navy photo by Petty Officer 2nd Class Ryan LeCompte, Public domain (PD-USGov-Military-Navy).

Latest rounds

DateCompanyRoundAmountCountrySector
Jul 2026Kraken Technology Group Series B$175MUnited KingdomMaritime
Jun 2026Hydromea Grant$1MSwitzerlandMaritime
Apr 2026Eelume Grant-NorwayMaritime
Apr 2026Online Oceans Seed£4MUnited KingdomMaritime
Mar 2026Mirai Robotics Pre-seed$4.2MItalyMaritime
Mar 2026SUBmerge Baltic Seed-LatviaMaritime
Mar 2026UFORCE Seed (Preqin: Series A)$50MUnited KingdomMaritime
Aug 2025Stormborn Seed-DenmarkMaritime
Jul 2025Kongsberg Ferrotech Seed€12MNorwayMaritime
Jul 2025SR Robotics Series A€8.4MPolandMaritime
Sep 2024HonuWorx Seed-United KingdomMaritime
May 2024Hefring Marine Seed€2.2MIcelandMaritime
Dec 2022Zelim Equity£2.3MUnited KingdomMaritime
Jun 2021Blueye Robotics Series A-NorwayMaritime

All companies

Full directory

Kraken Technology Group

Fareham, United Kingdom

Builds modular, open-architecture uncrewed surface vessels such as K3 Scout, K5 Kraken and K7 Sabre for surveillance, force protection and strike missions.

MaritimeSeries B / Jul 2026

Hydromea

Renens, Switzerland

Builds compact underwater drones, inspection robots and wireless optical communication for subsea monitoring and infrastructure security.

MaritimeGrant / Jun 2026

Eelume

Trondheim, Norway

Develops snake-like autonomous underwater vehicles for subsea inspection, maintenance and repair.

MaritimeGrant / Apr 2026

Online Oceans

Christchurch, United Kingdom

Builds Scout, a compact solar-powered autonomous surface vessel, and Tether fleet command software for maritime security and anti-submarine warfare.

MaritimeSeed / Apr 2026

Mirai Robotics

Puglia, Italy

Develops autonomous surface vessels and autonomy software for ISR and maritime patrol in coastal and offshore waters.

MaritimePre-seed / Mar 2026

SUBmerge Baltic

Riga, Latvia

Develops autonomous underwater drones for port security, mine countermeasures, hydrography and critical infrastructure inspection.

MaritimeSeed / Mar 2026

UFORCE

London, United Kingdom

Ukrainian-founded, UK-headquartered maker of combat-proven uncrewed air, land and sea systems, including Magura naval drones.

MaritimeSeed (Preqin: Series A) / Mar 2026

Stormborn

Frederiksberg, Denmark

Develops autonomous uncrewed surface vessels for defence and commercial offshore data acquisition.

MaritimeSeed / Aug 2025

Kongsberg Ferrotech

Kongsberg, Norway

Builds the Nautilus subsea robot that creates a dry habitat underwater to inspect and repair pipelines, risers and hulls, including 3D-printed metal repairs.

MaritimeSeed / Jul 2025

SR Robotics

Katowice, Poland

Develops remotely operated and autonomous underwater vehicles for seabed mapping, unexploded ordnance detection and hull cleaning.

MaritimeSeries A / Jul 2025

HonuWorx

Aberdeen, United Kingdom

Builds autonomous all electric submarine motherships deploying ROVs, remotely controlled from shore, for subsea inspection, maintenance and repair.

MaritimeSeed / Sep 2024

Hefring Marine

Reykjavik, Iceland

IMAS edge AI system giving real time onboard guidance and fleet analytics for crewed and uncrewed naval and patrol vessels.

MaritimeSeed / May 2024

Zelim

Edinburgh, United Kingdom

Maritime search and rescue company offering ZOE AI man overboard detection, the Swift recovery conveyor and the Guardian uncrewed rescue vessel.

MaritimeEquity / Dec 2022

Blueye Robotics

Trondheim, Norway

Makes portable underwater drones (ROVs) used by navies, coast guards and military engineers for inspection and mine countermeasures.

MaritimeSeries A / Jun 2021

dotOcean

Bruges, Belgium

Belgian maritime tech firm building multi-sensor surveillance above and below water, fusing radar, cameras, infrared and fibre acoustic sensing for critical infrastructure.

Maritimen/d

SEATOM Technologies

Porvoo, Finland

Developing modular micro nuclear reactors and nuclear propulsion for ships, naval and seabed operations and other extreme environments.

Maritimen/d

Triton Depth

Copenhagen, Denmark

Builds passive acoustic sensor networks to detect and classify underwater activity, including uncrewed underwater vehicles.

MaritimePre-seed