Sea Baby

Ukraine's SBU-developed multi-purpose uncrewed surface vessel — from one-way ramming strikes on the Kerch Bridge and Black Sea Fleet ships to a modular platform firing rockets, missiles, and mines, culminating in the world's first underwater drone attack on a submarine.

Overview

The Sea Baby (Ukrainian: "Морський малюк" – Mors'kyi malyuk) is a family of uncrewed surface vessels (USVs) developed in-house by the Security Service of Ukraine (SBU) for asymmetric naval warfare. Conceived as an explosive-laden one-way attack drone, the design has evolved into a reusable multi-mission platform capable of laying mines, firing thermobaric and artillery rockets, engaging air and surface targets with adapted missiles and heavy machine guns, and acting as a mothership for smaller aerial attack drones. Its heavy warhead — up to 850 kg on the baseline model and a claimed ~2,000 kg on the 2025 generation — made it the largest Ukrainian USV charge when revealed and was explicitly sized for fortified infrastructure targets such as the Kerch Bridge. A submerged derivative, “Sub Sea Baby,” achieved the world’s first successful uncrewed underwater vehicle (UUV) attack on a submarine in December 2025.

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