Could one autonomous underwater robot tip the naval balance of power in the Black Sea? Ukraine’s Toloka TLK-1000, which premiered at the Brave1 Defense Tech Valley 2025 exhibition in Lviv, is designed to do just that. With a 5,000 kilograms, payload, a 2,000 kilometers, range, and a depth rating of up to 300 meters, this lead-off model symbolizes the culmination of Ukraine’s accelerated development in unmanned naval warfare.
The TLK-1000 is the biggest in a family of combat-capable underwater drones that also comprises the TLK-150 and TLK-400. The TLK-150, a small “smart torpedo” powered by an electric motor, can carry 50 kilograms of explosives for 60 miles. The TLK-400, measuring 12 meters long, uses a combination of electric and internal combustion propulsion to conduct long missions lasting up to 60 days, with payloads of 500 kilograms that can travel 1,200 kilometers. The TLK-1000 miniaturizes this concept to tactical scale, combining optical, thermal, acoustic, and inertial AI networks for advanced autonomous navigation and targeting capabilities. Its hybrid propulsion system four electric motors combined with an internal combustion engine enables prolonged deep-water operations, and satellite communications with anti‑jamming communications measures against electronic warfare interference.
The Crimean Bridge, the 18-kilometer Russian connection to annexed Crimea, has already withstood a series of Ukrainian attacks, from truck bombs to unmanned surface vessel attacks. But its reinforced concrete pile bundles are still key weak points. As illustrated in the June 2025 underwater blast that reported damage the bridge’s mid-span abutments most likely dropped by a Marichka UUV such attacks can require extensive underwater inspections and repairs, strangling Russian supply lines. The TLK-1000 has a payload capacity much greater than that of the Marichka, as it can deliver charges that can disable large stationary targets on a single mission.
Ukraine’s strategy for underwater combat diverges dramatically from the high-priced models of other countries. While the U.S. Navy’s Orca Extra-Large Unmanned Undersea Vehicle is equipped with strike capacity, at $110 million it is not feasible for one-way missions. Ukraine’s doctrine stresses low-cost, mass-produced, attritable systems for deployment in large quantities to flood defenses. This “cookie batch” production strategy guarantees each subsequent production run includes battlefield input enhancing survivability, guidance, and payload integration without reducing deployment cycles.
Engineering problems in such systems are daunting. Autonomous underwater navigation has to deal with weakened or lost GNSS signals, and AI-INS with Doppler velocity logs, acoustic positioning, and loop closure techniques must be used to minimize drift. Communication is through sound waves, which are slow and bandwidth-limited, meaning real-time decision-making is based on embedded autonomy. The TLK-1000’s artificial intelligence components can replan routes dynamically, task-prioritize tasks, and identify underwater mines autonomously without any intervention, using multi-sensor inputs to sustain situational awareness in hostile waters.
Navies around the world are experiencing a “back to the future” moment of realization about the susceptibility of anchored ships and fixed installations to deep-water threats a la WWII mini-submarine attacks. As CSIS’s Mark Cancian pointed out, “A navy’s greatest vulnerability is in port when ships are stationary for an extended period and an adversary can execute a strike that requires time to plan and execute.” Ukraine’s campaign has already pushed Russia’s Black Sea Fleet east and out of high-risk areas such as Sevastopol, and to spend considerably on layered port defenses.
The TLK-1000’s adaptability isn’t limited to attack missions. Its modular architecture facilitates mine countermeasures, acoustic surveillance, and seabed surveying. Company officials attested, “Our drones independently detect, classify, and neutralize underwater mines, significantly increasing the safety and efficiency of maritime operations.” This dual-role capability maximizes operational flexibility by enabling the same vehicle to perform both combat and support missions.
For Ukraine, combining the TLK-1000 with multi-domain operations mixing underwater attack with FPV drone swarms, missile strikes, and electronic spoofing produces a “dilemma cascade” that pushes Russian defenses to their limits. The Black Sea is now a live laboratory for such operations, where attritable unmanned systems are reliably beating larger, high-value units in contested littorals. Here, the TLK-1000 is not merely another weapon; it is a strategic tool that can remake the maritime battlefield.
