Sea Trident

Ukraine's first heavy underwater drone — a roughly 10-tonne, container-sized autonomous submarine pitched for three jobs: strike with a one-tonne warhead, undersea cargo, and the unusual role of hunting other underwater drones. Unveiled at a Paris arms show in June 2026, it is a maker's prototype: every figure here is vendor-declared and unproven.

Overview

The Sea Trident (catalogued by naval analyst H.I. Sutton as the SL-1000) is a Ukrainian extra-large uncrewed underwater vehicle (XL-UUV) presented by the maker Global Mark — until now an aerial-drone and electronic-warfare firm — as its first underwater system. Unlike Ukraine's famous surface sea drones (Magura V5, Sea Baby), the Sea Trident runs submerged for low observability, and is marketed for strike (up to a 1,000 kg payload against strategic and coastal targets), logistics/cargo, and counter-UUV interception. A hard caveat frames this entire entry: the system was revealed at the Eurosatory 2026 trade show, every specification is a vendor placard claim, there is no defence-ministry statement, datasheet, test data or combat evidence, and one independent analysis (Sutton) disputes the headline range — so this is best read as a commercial debut, not a fielded capability.

Development

Global Mark built its name on FPV/aerial drones and EW before turning to the undersea domain; the Sea Trident is its first UUV and was shown publicly for the first time at Eurosatory 2026 in Paris on 15 June 2026. Euromaidan Press explicitly read the export-show debut as "commercial market positioning rather than operational deployment," and no operator or order has been reported. It enters a Ukrainian undersea-drone field that already includes smaller UUVs such as Toloka and Marichka, but at a markedly larger, strike-oriented scale.

🔒 The rest of the Sea Trident file is for BattlePolicy Pro members. Stop here and you miss the part that actually matters: how it performs and where it falls short, its combat record, how it stacks up head-to-head against its real counterparts, the complete specifications table, and our analysts’ procurement, supplier and assessment notes. Unlock the full file with BattlePolicy Pro →