Greek Containership Sunk by Naval Drones Off Bulgaria as Black Sea Attacks Escalate

The Liberian-flagged CONTSHIP JET sank after three naval drones struck it on Wednesday. It was carrying 421 containers and traveling from Haifa, Israel, to Constanța, Romania. All 14 Filipino and four Ukrainian crew members were rescued and taken to Varna. The sinking matters because it brought drone attacks directly against commercial shipping in the western Black Sea.

The attack happened as the vessel passed through Bulgaria’s Exclusive Economic Zone, or EEZ. That zone lies beyond a country’s territorial waters. Reuters-verified video showed a sea drone moving beside the ship before turning toward its hull. Another video showed an explosion, after which the vessel began listing and eventually sank.

The attacker’s identity remains unknown. Ambrey assessed that the black, 5-to-6-meter unmanned surface vessel was likely related to Russia’s Murena-300S design. Bulgaria reported no visible pollution during initial inspections, although the cargo included batteries, acids, corrosive liquids, and industrial components.

A naval drone, also called an unmanned surface vessel or USV, is a boat that operates without people aboard. An operator can guide it remotely, often from a distance. Because it carries no crew, the attacker can send it toward a dangerous target without placing sailors in the craft. The article describes a matte-black USV about 5 to 6 meters long.

A USV can damage a large ship by ramming its hull, detonating an explosive charge, or doing both. In this incident, video showed the drone approaching at high speed and turning toward the CONTSHIP JET. Separate footage showed an explosion, and the container ship later listed and sank. The exact weapon carried by the drone was not identified.

Ambrey said the craft’s maneuvers indicated remote control. It assessed that the drone was likely a variant of, or derived from, Russia’s Murena-300S design. The attacker’s identity remains unconfirmed.

At least six ships have reportedly been attacked by drones off Bulgaria during the month covered by the report. Government statements also said about two dozen seafarers were feared dead. Those figures show that the CONTSHIP JET incident was not an isolated event, but part of a wider pattern affecting commercial traffic in the western Black Sea.

The article does not identify the attackers in these incidents. Bulgaria’s Prime Minister Rumen Radev said some attacks appeared to benefit Russia, while Moscow denied involvement in recent attacks. A former Ukrainian navy officer said the drone shown in the CONTSHIP JET video did not resemble Ukrainian naval-drone models he knew.

The reported toll has increased pressure on Bulgaria to improve maritime security. The country, which belongs to both the European Union and NATO, has sought assistance for its Black Sea coast. Bulgarian authorities said a French patrol aircraft warned them about a possible attack, but they could not stop it.

The CONTSHIP JET was traveling because it was carrying commercial cargo between two ports. Its voyage began in Haifa, Israel, and was headed for Constanța, Romania. The ship carried 421 containers, showing that the western Black Sea remained in use for commercial transport even while Russia’s war in Ukraine created serious maritime risks.

The article does not state why the operator chose this route or why the voyage continued despite the war. It only gives the ship’s route and cargo details. The vessel passed through Bulgaria’s EEZ, but outside Bulgarian territorial waters, when the drones attacked. Its crew included 14 Filipinos and four Ukrainians.

That continued traffic matters because attacks can affect ships that are not described as military targets. The incident raised concerns about the war’s widening impact on commercial shipping. It also prompted Bulgaria to seek assistance and exposed the limits of warnings when authorities cannot prevent an attack.

An Exclusive Economic Zone, or EEZ, is a sea area where a coastal country has special rights to explore, use, and manage natural resources. Under widely accepted international law, an EEZ can extend up to 200 nautical miles from the coast. It is not the same as national territory, and foreign ships generally retain navigation rights there.

Territorial waters are closer to shore, normally extending up to 12 nautical miles. A coastal state exercises sovereignty there, subject to internationally recognized navigation rules. The CONTSHIP JET was attacked inside Bulgaria’s EEZ but outside its territorial waters. That distinction explains why the location was described so precisely.

The difference does not make an attack on a commercial vessel harmless or legally simple. It places the incident beyond Bulgaria’s territorial sea while still occurring in an area connected to Bulgarian maritime security. Bulgarian authorities had been warned by a French patrol aircraft but were unable to prevent the strike.

If attacks continue, commercial ships could be damaged or sunk, crews could be killed, and cargo could be lost. Shipping companies may face greater danger, delays, or pressure to avoid parts of the western Black Sea. The article already reports at least six attacked ships and about two dozen seafarers feared dead, showing the human cost could be severe.

Cargo can create additional risks after a strike. The CONTSHIP JET carried lithium-ion batteries, corrosive liquids, acids, and industrial components. Damage or fire involving such materials could threaten rescuers, other vessels, and coastal areas. In this case, initial inspections found no visible pollution, but that result does not remove the broader hazard.

Coastal authorities may need more patrols, aircraft, warnings, and international assistance. Bulgaria has sought help to strengthen security, yet a French patrol aircraft’s warning did not prevent this attack. Continued incidents could therefore expose both the vulnerability of trade and the limits of existing monitoring.

Naval drones change the balance by allowing an attacker to threaten a large commercial ship with a much smaller craft. The drone needs no onboard crew, so the operator avoids risking sailors during the approach. Its small size and remote control can also make detection and interception difficult. The article does not provide a price comparison, but such systems are generally far cheaper than the ships they threaten.

The CONTSHIP JET illustrates the mechanism. Ambrey described a matte-black USV about 5 to 6 meters long approaching at high speed. Video showed it turning toward the container ship’s hull, followed by an explosion. The vessel carried 421 containers, yet three sea drones badly damaged it and caused it eventually to sink.

This imbalance gives drones effects beyond their physical size. A single craft can endanger crews, cargo, trade routes, and coastal responders. The repeated attacks off Bulgaria also show how commercial shipping may require stronger surveillance, faster warnings, and defenses against remotely operated vessels.