REPORT: Sea Trident ST-1000 — the 10-ton Ukrainian underwater drone redefining naval warfare

REPORT: Sea Trident ST-1000 — the 10-ton Ukrainian underwater drone redefining naval warfare

Introduction: Paris, Eurosatory 2026 — the submarine weapon no one saw coming

Ukraine's first major underwater drone unveiled in Paris

On June 15, 2026, at Eurosatory 2026 in Paris, the Ukrainian company Global Mark unveiled for the first time its Sea Trident ST-1000 — an Extra-Large Uncrewed Underwater Vehicle (XLUUV) that represents a major technological breakthrough in Ukrainian naval capabilities. Ten meters long. Two meters wide. Ten tons. A range of 2,000 nautical miles. An operational depth of 60 meters. And a payload capacity of up to 1,000 kg.

This is not a laboratory prototype — it is a functional system presented at one of the most rigorous defense exhibitions in the world. Global Mark displayed it before buyers and industrial partners from some fifty countries. The Sea Trident ST-1000 marks Ukraine's entry into a category of naval systems that only the world's great military powers had mastered until now. And it says something essential about the transformation of naval warfare that the Black Sea is teaching the world.

Ukraine and the naval drone revolution

Ukraine has already proved its mastery of surface naval drones — the Magura, Marichka, and other systems that forced the Russian Black Sea Fleet to withdraw from Sevastopol. The Sea Trident represents the third dimension of that naval revolution: the underwater domain. With this system, Ukraine can threaten Russian naval targets from the surface, from the air, and now from the depths — a combination that makes Russian naval defense extraordinarily complex.

This report is from a journalist who has followed the transformation of Ukrainian naval capabilities closely since 2022 and who recognizes in the Sea Trident ST-1000 a qualitative leap whose implications extend far beyond the Black Sea. This drone is a system that will be studied, copied, and adapted by navies around the world. And it was developed by a Ukrainian company during an existential war.

Technical specifications: a world-class XLUUV

Dimensions, weight, and core capabilities

The Sea Trident ST-1000 measures 10 meters long, 2 meters wide, and 1.5 meters high (without the mast assembly). It weighs 10 tons — a mass that places it in the Extra-Large UUV category under NATO terminology, which distinguishes small AUVs weighing a few dozen kilograms from large-scale systems capable of strategic missions. For comparison, the XLUUV programs developed by the United States (Boeing's Orca program) and the United Kingdom (Cetus program) fall into this same size and weight range.

Cruising speed is 6 knots, with a maximum speed of 10 knots. Those speed figures are consistent with the principal tactical uses: discrete penetration of defended zones, mine laying, precision strikes, and payload delivery. The operational depth of 60 meters is sufficient to operate under most surface sonar detection systems, though shallower than conventional submarines — reflecting a specialization for shallow-water operations such as the Black Sea or the Baltic Sea.

The 2,000 nautical mile range: strategic autonomy

The range of 2,000 nautical miles is the most impressive specification of the Sea Trident ST-1000. To put that figure in perspective: the Black Sea spans approximately 600 nautical miles from east to west. A range of 2,000 nautical miles means the Sea Trident can cross the entire Black Sea multiple times without refueling — launching from Ukrainian bases, striking targets anywhere across the Black Sea, and returning. Or, in other geographic contexts, operating at distances that give it truly strategic autonomy.

That range, combined with its autonomous navigation capability and underwater stealth, makes the Sea Trident ST-1000 a system potentially capable of missions well beyond Ukrainian coastal waters. The same technology that allows it to threaten Russian ships in the Black Sea could, in other deployment contexts, reach objectives across a much broader area.

The 1,000 kg payload: four distinct missions

Kamikaze, logistics, interception, and FPV drone carrier

The Sea Trident ST-1000's 1,000 kg payload can be configured for four fundamentally different missions, according to Naval News: kamikaze strike (a 1,000 kg explosive charge for the destruction of ships or coastal infrastructure); logistical delivery (transport of cargo, supplies, or materials into contested zones); interception and neutralization of other UUVs (enemy underwater drone hunter); and FPV drone carrier (launching micro-drones from depth).

That mission versatility is one of the most remarkable features of the system. The same vehicle can serve as a highly destructive strike weapon, a discreet logistical carrier, an anti-UUV hunter, or an advanced launch platform for aerial drones. The operational flexibility that provides military commanders is considerable — it makes the system unpredictable for the adversary and adaptable to a wide variety of tactical scenarios.

The kamikaze mission: 1,000 kg of explosives below the waterline

The kamikaze mission deserves particular attention. A 1,000 kg charge placed below the waterline of a warship or commercial vessel is a lethal threat to virtually any type of surface ship. Conventional torpedoes, which operate on similar principles, use 300–400 kg charges to sink ships. A charge of 1,000 kg exploding beneath a ship's hull creates a water column and bubble jet that can fracture even the most robust structures.

For the Russian Black Sea Fleet, already forced to withdraw from Sevastopol under pressure from Ukrainian surface drones, the prospect of also having to contend with long-range autonomous underwater threats adds an additional layer of operational complexity. Defending against surface drones is hard. Defending against underwater drones simultaneously is harder still.

Stealth: 5-meter depth to penetrate contested zones

Operating at 5 meters as a tactical tool

One of the most sophisticated tactical features of the Sea Trident ST-1000 is its ability to operate at just 5 meters depth for discrete infiltration into contested maritime zones. At that depth, the system is invisible to surface radars, extremely difficult to detect by high-frequency sonars calibrated for deep underwater threats, and practically undetectable visually from surface vessels.

That very-shallow-depth infiltration capability enables operational scenarios that surface drones cannot achieve: slipping under anti-drone net barriers, bypassing port defenses, approaching anchored or underway ships from an unexpected direction. This is an operational dimension that does not exist with current Ukrainian surface drones like the Magura — and it fills a critical tactical gap in Ukraine's naval arsenal.

Comparison with the American Orca program

The Sea Trident ST-1000 is comparable in its category to Boeing's American Orca program — an XLUUV developed for the US Navy with similar characteristics (large size, long range, mission versatility). But the Orca took years to develop, with Department of Defense resources and billions of dollars in contracts. The Sea Trident was developed by a Ukrainian startup, under fire, with incomparably more limited resources.

This comparison is not meant to imply the Sea Trident is better than the Orca — full specifications remain partially confidential and real-world performance remains to be proven. It is meant to illustrate that Ukraine developed a system of this sophistication in a context where no defense expert would have bet on it four years ago.

Black Sea missions: a perfect operational context

The Black Sea as a unique testing ground

The Black Sea presents characteristics that make it an ideal operational environment for the Sea Trident ST-1000. Maximum depth of approximately 2,200 meters (with large shallow zones along Ukrainian and Romanian coasts), a limited geographic space that maximizes coverage with a 2,000 nautical mile range, the presence of a hostile enemy fleet, and the absence of significant adversary underwater naval forces — Russia has not operated attack submarines in the Black Sea since Ukrainian strikes made Sevastopol too dangerous.

That context means the Sea Trident ST-1000 could operate in the Black Sea without facing the primary threat that makes underwater systems vulnerable: enemy submarines. Russia's principal defenses against this system would be hull-mounted sonars on surface ships, anti-submarine helicopters, and perhaps Russian underwater drones — all defenses that the 5-meter operating depth and 10-knot speed significantly complicate.

The shadow fleet and Russian tankers as potential targets

Ukrainian sources have discussed the development of naval drones capable of intercepting and seizing vessels from the Russian shadow fleet — the tankers circumventing Western sanctions to transport Russian oil. If the Sea Trident ST-1000 can be configured for an interception mission (not only destruction), it could become a tool for enforcing maritime sanctions that Ukraine claims in its maritime space and beyond.

That is a strategic dimension that naval analysts are beginning to explore. An underwater drone capable of discreetly approaching a tanker, placing charges, disrupting its propulsion systems, or even — in future configurations — forcing it to stop would be a revolutionary instrument of maritime economic pressure. The Black Sea as an experimentation ground for new forms of naval economic warfare.

Global Mark: the company behind the Sea Trident

A company about which little is known — and that is normal

Global Mark, the Ukrainian company behind the Sea Trident ST-1000, is little known to the general public. That is deliberate: companies developing sensitive weapons systems during an active war have good reasons to maintain a low profile. What is known: the company developed Ukraine's first XLUUV, presented it at Eurosatory 2026 before a serious international audience, and produced technical specifications consistent with the capabilities announced.

The choice to present the Sea Trident at Eurosatory is itself a strategic decision: it is the signal of a company that wants to export, that is looking for industrial partners, and that is sufficiently confident in its capabilities to expose them to international competition. That is not the posture of a fragile startup — it is that of a company that believes in its product.

The Ukrainian innovation chain: from necessity to export

Global Mark fits within the same innovation chain as Fire Point (Flamingo, FP-9), Luch (Neptune), and other Ukrainian companies that transformed the necessity of war into industrial excellence. The difference: where Fire Point and Luch have documented operational track records (confirmed strikes, the Moskva sunk), Global Mark is presenting its first major system. The coming months will reveal whether the Sea Trident can join the club of Ukrainian systems proven in real combat.

If it does — and the technical specifications presented at Eurosatory suggest the foundations are solid — the Sea Trident ST-1000 will redefine the underwater threat in the Black Sea and position Ukraine as an exporter of large autonomous underwater systems. A market that does not yet truly exist — and that Ukraine could be the first to occupy seriously.

Implications for the Baltic Sea and other theaters

The transferability of the concept to European theaters

The Sea Trident ST-1000 was designed for the Black Sea — but its technical characteristics make it applicable to other naval theaters. The Baltic Sea, shallow (25–50 meters on average) and geographically constrained like the Black Sea, is an environment in which NATO member nations' navies are increasingly thinking about the threat posed by Russian underwater drones. A Sea Trident adapted for the Baltic would be a leading defensive and offensive tool for the NATO members bordering it.

The presentation at Eurosatory was clearly targeting that potential market. Representatives from Baltic, Scandinavian, and other NATO member navies were present at the exhibition. Interest in Ukrainian underwater systems proven under real combat conditions is real — and a purchase or co-development agreement from a NATO member would instantly transform Global Mark's commercial standing.

Unmanned submarine warfare: the next frontier

The Sea Trident ST-1000 is part of a broader trend: unmanned submarine warfare is the next frontier in naval conflict. Major military powers are investing massively in XLUUVs because they offer capabilities that conventional submarines cannot provide: long-duration missions without human risk, smaller sizes that simplify deployment, unit costs lower than nuclear or conventional submarines, and potentially reduced acoustic signatures.

By developing the Sea Trident ST-1000, Ukraine is not only building a weapon for this war. It is building expertise in a category of systems that will define naval warfare for decades to come. That expertise — acquired under real combat pressure — will be one of Ukraine's most valuable strategic assets after the war, in its relationships with NATO's naval allies.

The export market: who could buy the Sea Trident ST-1000?

Potential buyers and priority markets

The presence of the Sea Trident ST-1000 at Eurosatory 2026 signals commercial openness. The most natural potential buyers are the navies of countries bordering shallow seas where large autonomous underwater systems would hold strategic value: the Baltic states (Estonia, Latvia, Lithuania), Sweden, Finland, Poland, Romania, and Bulgaria for the Black Sea. All of these countries share a growing concern about the Russian underwater threat.

Middle East and Southeast Asian countries represent another potential market: navies operating in shallow straits and contested coastal waters — the Persian Gulf, the Strait of Malacca, the South China Sea — could find in the Sea Trident an asymmetric deterrence tool against adversaries with greater conventional military strength. The 2,000 nautical mile range opens geographic possibilities that very few current systems can offer at this size and cost.

Diplomacy through hardware: the drone as a foreign policy argument

For Ukraine, selling the Sea Trident ST-1000 to strategic partners is not only a commercial matter — it is diplomacy through hardware. Every country that acquires a Ukrainian system becomes a defense partner with a concrete interest in the success of the Ukrainian defense industry. That integration creates ties that transcend political declarations and agreements on paper.

France with its BRAVE FRANCE program, Germany with its technology agreements, Sweden producing Ukrainian MAUL drones — each of these partners now has an economic stake in the survival and prosperity of Ukrainian industry. That is the best kind of security: not promises, but well-understood mutual interests.

Conclusion: the Sea Trident as a symbol of a Ukraine innovating for tomorrow

Beyond the current war

The Sea Trident ST-1000 is a weapon for the current war — but it is also much more than that. It is a system that points to what naval warfare will look like over the next few decades. Large autonomous underwater vehicles operating across thousands of nautical miles without human intervention, capable of multiple mission types, produced at industrial scale — that is the direction every major navy in the world is heading.

Whether the Sea Trident is deployed operationally in the coming months or serves primarily to establish Global Mark's position on the international market, its presentation at Eurosatory 2026 is a historic moment for the Ukrainian defense industry. And one more signal that Ukraine in 2026 is not only a country defending itself — it is a country inventing the future of warfare.

A report that will stay with me

I have been covering the war in Ukraine for more than four years. I have seen highs and lows, victories and defeats, heroes and tragedies. The Sea Trident ST-1000 is one of the most striking artifacts of this extraordinary period: a machine developed under the bombs, presented in Paris, capable of threatening the navies of powers that did not think they would need to defend from that direction. If that is not national resilience transformed into industrial excellence, I don't know what is.

By Maxime Marquette, columnist

Columnist's transparency note

What I assert and what I do not know

The specifications of the Sea Trident ST-1000 — dimensions, weight, range, depth, payload, missions — come from Naval News, a specialized naval defense publication known for its technical rigor. These specs are those presented by Global Mark at Eurosatory — they reflect the company's claims, not independent testing. Real-world performance under combat conditions remains to be confirmed.

I have never visited Global Mark's facility nor had access to classified technical documents. My analysis is based on available open-source material. The comparison with the American Orca program is based on publicly known characteristics of both programs.

Stated editorial bias

I am pro-Ukrainian and enthusiastic about Ukrainian defense innovations. That bias may lead me to present Ukrainian developments more favorably than a strictly neutral analyst would. I try to balance that enthusiasm with factual rigor — but readers should be aware of it and read this analysis in that light. The Sea Trident deserves the enthusiasm. It also deserves caution about performance not yet proven in combat.

What is indisputably true: the system was presented at Eurosatory, its specs were made public by Global Mark, and it represents a capability Ukraine did not have two years ago. Those three facts are solid.

Sources

Primary sources

Naval News — Ukraine's massive new underwater drone Sea Trident ST-1000 — June 26, 2026

News Ukraine RBC — Ukraine prepares sea drones for new missions — June 2026

EuroMaidan Press — Russia's sea drones run on smuggled Starlink — June 24, 2026

Secondary sources

Richard Young — Black Sea warning for the world's navies — June 2026

Aerospace Global News — Ukraine drones on Russian warships — June 2026

Shephard Media — Eurosatory 2026 wartime iteration — June 2026