PROFILE: Sea Trident, a 10-metric-ton underwater drone that is reshaping naval warfare

Maxime Marquette

2026-06-22 15:23:00

Ten meters, sixty meters, ten knots

The Sea Trident is ten meters long, two meters wide, and 0.5 meters high. Depth: sixty meters.

Speed: ten knots. Range: two thousand nautical miles, or three thousand seven hundred kilometers. Figures worthy of a major naval power.

Navigation via GPS and Starlink

The vessel travels 100 kilometers while submerged, surfaces, checks its position via GPS and Starlink, then immediately dives again.

This staged navigation protocol reduces exposure time at the surface. The vehicle remains out of range of enemy radar.

One hundred kilometers underwater, a few seconds on the surface to reorient, then back down—this is the level of stealth that major navies have not yet mastered at this cost.

Modular payload: kamikaze or logistics?

1,000 kilograms, adaptable to any mission

Maximum payload: 1,000 kilograms. This single figure sets the Sea Trident apart from any other Ukrainian platform.

Kamikaze mode against naval targets. Transport of FPV drones, equipment, or ammunition to forward positions that would otherwise be inaccessible.

ISO container: discreet deployment from any port

The Sea Trident can be transported in a standard ISO container. No specialized equipment is required. An ordinary merchant ship is sufficient for deployment.

Any port becomes a potential launch base. The logistics are as discreet as the vehicle itself.

A 1,000-kilogram naval drone in a 20-foot container—Ukraine has transformed commercial maritime logistics into a strategic asset. Naval authorities need to give this some thought.

A Generational Leap: Sea Trident vs. Toloka

The Limitations of the Toloka Semi-Submersible

The Toloka drone, deployed in the Black Sea as early as 2022, had demonstrated Ukraine’s ability to threaten the Russian fleet with low-cost vehicles.

But the Toloka operated on the surface, exposed to radar and countermeasures. Its stealth capabilities remained limited. Its payload was insufficient.

Sea Trident: Diving, Hunting, and Striking All in One

The Sea Trident operates at a depth of sixty meters, out of range of surface radars. It can also hunt down enemy underwater drones—a completely new capability.

The gap between the Toloka and the Sea Trident is akin to that between a speedboat and a combat submarine. It was bridged in less than four years.

This leap forward is no accident. It is the result of the pressure to survive, which transforms engineering into an ultimate weapon. Necessity remains the only driving force that has never failed.

The stated targets: the Black Sea and strategic infrastructure

Novorossiysk, Sevastopol, critical seabeds

With a range of 2,000 nautical miles, the Sea Trident can directly reach the Russian naval bases in Novorossiysk and Sevastopol.

Targets also include undersea cables, pipelines, and critical infrastructure. Its scope is much broader than that of a surface drone.

Hunting Enemy Underwater Drones

The Sea Trident is designed to hunt down enemy underwater vehicles. Russia is developing its own underwater drones. Ukraine is preparing countermeasures.

Dual function: offensive strikes and defensive hunting. A fully-fledged seabed surveillance system.

When Ukraine talks about hunting down Russian underwater drones, it asserts that the war has spread beneath the sea—and that it is already prepared for this today.

The skeptics' perspective: The trials will reveal the truth

At an advanced stage, but not finalized by June 2026

Analysts cited by EADaily have questioned the Sea Trident’s operational maturity. Global Mark itself describes it as fairly advanced—with testing scheduled for 2026.

The transition from a prototype to a combat-deployable system is a leap that has brought many projects to an end.

What skepticism cannot change

Even skeptics acknowledge the feat. A ten-metric-ton XLUUV, housed in an ISO container, with a range of two thousand nautical miles—unprecedented for any country outside the major naval powers.

Russia: decades for its submarines. Ukraine: this, under bombardment, built from scratch.

I cannot guarantee that the Sea Trident will dive to sixty meters on its first test. But building this vessel under these conditions—that in itself is already a victory.

Naval Strategy Without a Conventional Fleet

A drone navy built out of sheer necessity

Since 2022, Ukraine has lost or scuttled its surface ships. Its conventional navy no longer exists as an operational combat force.

Kyiv has replaced the ships with swarms of drones—first the Magura V5, then the Sea Trident—creating a navy without sailors at risk.

A doctrine that produces verifiable results

The Magura V5 has shot down Su-30SM aircraft with missiles. The Sea Trident can threaten targets at a range of three thousand seven hundred kilometers.

This official doctrine—funded and deployed—stands up to the world’s second-largest navy without resorting to improvisation.

Having no fleet and inventing an entirely new naval doctrine—that is what absolute necessity produces when it meets Ukrainian engineering ingenuity.

The Black Sea: A Closed Theater Where Stealth Is Key

An enclosed body of water ideal for underwater drones

The Black Sea is an enclosed body of water, monitored from all sides. Every movement on the surface is immediately detected by enemy radar.

The Russian Black Sea Fleet lost the cruiser Moskva in April 2022. The Sea Trident represents an invisible and constant underwater threat.

Grain corridors as a strategic issue

The Black Sea is vital for Ukrainian grain exports. Controlling its waters holds considerable economic and diplomatic value.

A drone operating at a depth of sixty meters is changing the rules for all players in this strategic basin.

The Black Sea is not just a theater of war. It is a vital artery for global markets. Whoever controls its waters controls part of the planet’s food supply.

Reduced Acoustic Signature: The Art of Disappearing

Multispectral Stealth as a Technical Doctrine

Submarines are detected by their acoustic emissions. The Sea Trident was designed with a minimal acoustic signature, making it difficult for enemy sonar to locate.

A low thermal signature and materials that limit the magnetic signature—this multi-spectral stealth makes this vessel particularly formidable.

The Element of Surprise as a Force Multiplier

A vessel that goes undetected cannot be intercepted. The Sea Trident applies submarine doctrine at a radically lower cost.

For the Russian Navy, the emergence of an autonomous Ukrainian underwater threat represents a paradigm shift it had not anticipated.

An invisible, inaudible weapon with a 1,000-kilo payload—this is exactly the kind of threat that turns a maritime strategy into a constant logistical nightmare.

NATO Funding and Integration: Next Steps

Eurosatory as a Showcase for Industrial Partners

The Sea Trident was unveiled at Eurosatory 2026 to attract Western partners. Global Mark is seeking investments and co-development contracts.

Integration into NATO networks—to ensure interoperability of navigation, communication, and targeting systems—is a prerequisite for operational maturity.

An R&D Investment in the Most Active Battlefield

The allies funding the Sea Trident are investing in a class of weapons that their own navies will master in the future.

The United States, the United Kingdom, and Germany are all developing underwater drones. A partnership with Global Mark would offer four years of real-world combat experience.

Funding Sea Trident is not charity. It is an investment in R&D on the world’s most intense battlefield since 1945. No laboratory can offer that.

What This Portrait Reveals About Ukraine in 2026

An industrial ecosystem born amid the bombs

Sea Trident is part of an ecosystem comprising several hundred Ukrainian companies founded since 2022: FPV drones, air defense, ground robots, and autonomous submarines.

This ecosystem is unique in the world. No defense industry has ever been built so quickly, under such constraints.

From total dependence to global exporter in four years

In 2022, Ukraine was entirely dependent on its partners for heavy equipment. By 2026, it was exporting its technologies at the most prestigious defense trade shows.

An unprecedented industrial transformation, catalyzed by the absolute necessity to survive against the world’s second-largest army for four years.

What Eurosatory 2026 demonstrated is a nation that chose innovation over surrender. Eighty companies in Paris—this is a choice that defines a civilization.

Complementarity with the Ukrainian drone fleet

Magura, Sirena, Sea Trident: A Comprehensive Naval Capability

The Magura V5 operates at high speed on the surface. The Sirena launches anti-aircraft missiles. The Sea Trident strikes deep underwater.

These three platforms cover the entire naval spectrum: surface, air, and seabed. A complete drone navy, without a single sailor on board.

Starlink as the backbone of coordination

The Sea Trident uses Starlink for its navigation links—the same network as the Magura and Ukrainian land-based drones.

This network interoperability enables multi-domain coordination that few militaries—even the most advanced—can master with such diverse systems.

A saillorless navy, coordinated by satellite, striking on the surface, in the air, and underwater—this is no longer 20th-century doctrine. This is the next war.

Looking Ahead to 2026: Crucial Trials and a Model for Export

The tests that will validate the announced promises

Global Mark plans to conduct comprehensive tests of the Sea Trident in 2026. Diving to sixty meters, sailing a hundred kilometers—every parameter must be validated at sea.

These trials will determine whether the specifications announced at Eurosatory match actual performance. The stakes are high for the credibility of the Ukrainian defense industry.

A model for small allied navies

If the Sea Trident proves its capabilities, it will become a model for nations seeking an asymmetric submarine capability without the cost of a full-scale submarine.

For NATO, for Pacific nations monitoring China, and for any actor needing to counter a superior naval power—this is a new, accessible path.

If a country under bombardment can design an underwater drone of this scale, what does that say about nations at peace that are slow to innovate? The question deserves an answer.

The Sea Trident vs. the Russia-China-Iran Axis: A Systemic Weapon

A drone forcing Russia to defend its naval bases

The existence of the Sea Trident forces Russia to invest in the underwater defense of its naval bases. Every resource devoted to this is diverted from the land front.

This is the logic of asymmetric warfare: forcing the adversary to defend everywhere what it cannot protect.

A message to Beijing, Tehran, and Pyongyang

The Sea Trident is not just a message to Russia. It is a signal to China, Iran, and North Korea: Western and Ukrainian innovation is exportable and credible.

What they’ll see at Eurosatory 2026: a Ukraine that is shaping the future of naval warfare.

A Ukrainian underwater drone on display in Paris sends a message to Beijing as much as to Moscow: the West and its partners are innovating faster than you are destroying.

Conclusion: Ten metric tons of silence that are changing the rules of the naval game

A real system, born amid the fiercest bombardment

The Sea Trident is not a symbol. It is a real weapons system, unveiled to military delegations from around the world in Paris in June 2026.

Ten metric tons. One thousand kilograms of payload. Two thousand nautical miles. Sixty meters. These figures tell a story that no one had dared to write for Ukraine.

The question posed to the entire international community

Ukraine, without a fleet, is developing a naval doctrine that threatens established maritime powers. Innovation born of necessity. Engineering born of destruction.

The question is not whether the Sea Trident will succeed in its trials. It is how the world will respond to a nation that refuses, even under bombardment, to stop innovating.

By Maxime Marquette, columnist