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Defence & Security13 Oct 2026 · about 6 min

Drone attack sinks ship off Bulgaria coast, second strike in a week

The brief

The latest attack involved two vessels near Bulgaria’s Black Sea coast. Chelsea 3 was hit but remained afloat, while the other vessel sank. The incident matters because it occurred about 18 nautical miles offshore, near busy commercial routes. Three drones struck Chelsea 3, a Maltese-flagged ship owned by a Ukrainian company. All 15 crew members were rescued safely. The other vessel was also hit during the attack and sank, but the source does not identify its flag, name, or casualties. Bulgarian Prime Minister Rumen Radev said no clear evidence identified those responsible. He called it the second such incident in a week and planned talks with NATO Secretary-General Mark Rutte. Repeated attacks could make shipping riskier and disrupt grain and other trade through the Black Sea.

01

What happened to the Chelsea 3 and the other vessel in the latest drone attack?

The latest attack involved two vessels near Bulgaria’s Black Sea coast. Chelsea 3 was hit but remained afloat, while the other vessel sank. The incident matters because it occurred about 18 nautical miles offshore, near busy commercial routes.

Three drones struck Chelsea 3, a Maltese-flagged ship owned by a Ukrainian company. All 15 crew members were rescued safely. The other vessel was also hit during the attack and sank, but the source does not identify its flag, name, or casualties.

Bulgarian Prime Minister Rumen Radev said no clear evidence identified those responsible. He called it the second such incident in a week and planned talks with NATO Secretary-General Mark Rutte. Repeated attacks could make shipping riskier and disrupt grain and other trade through the Black Sea.

02

How many ships have been attacked or sunk in the two incidents reported near Bulgaria, and how many crew members were rescued?

Four ships were attacked, damaged, or sunk across two incidents near Bulgaria. Fifteen crew members were rescued, highlighting the danger to commercial shipping. The attacks occurred near an important route for grain and other goods.

In the latest incident, three drones struck the Maltese-flagged Chelsea 3, about 18 nautical miles offshore. Its 15 crew members were rescued, while another vessel sank. In the October 6 incident, drones struck two more ships in Bulgaria’s exclusive economic zone.

The Togo-flagged Alfa Watan sank, while the grain carrier Able was damaged. Bulgarian officials said there was no clear evidence identifying those responsible. The repeated attacks have increased concerns about maritime security and could disrupt trade through the Black Sea.

03

What are Bulgaria’s territorial waters and exclusive economic zone, and how are they different?

Bulgaria’s territorial waters extend up to 12 nautical miles from its coast. They are treated largely like Bulgarian territory, although foreign ships generally retain a right of peaceful passage. Its exclusive economic zone, or EEZ, can extend up to 200 nautical miles. Bulgaria controls seabed resources and economic activities there, but does not own the entire sea or control every passing vessel.

This distinction matters in the reported attacks. The Maltese-flagged Chelsea 3 was struck about 18 nautical miles offshore, placing it beyond the usual 12-mile territorial limit and within Bulgaria’s EEZ. Earlier, drones hit ships in Bulgaria’s EEZ, including the Togo-flagged Alfa Watan, which sank. An EEZ gives Bulgaria enforcement and resource rights, not automatic responsibility for every attack.

The incidents show why the difference matters for security. Bulgaria is a NATO member, and commercial ships use the Black Sea for grain and other commodities. The source says 15 Chelsea 3 crew members were rescued, but identifies no clear attacker. Continued strikes could disrupt trade and increase risks for shipping operators.

04

Why is the Black Sea an important route for Ukrainian grain and other commodities?

The Black Sea is a major maritime link between Ukraine’s producers and overseas buyers. Ships can carry large quantities of grain and other commodities efficiently. That makes the waterway important for keeping food and trade moving.

Recent attacks show how quickly that connection can be threatened. On October 6, the Togo-flagged Alfa Watan sank, while grain-carrying Able was damaged. In the latest incident, three drones struck Chelsea 3 about 18 nautical miles from Bulgaria, while another vessel sank.

These incidents do not prove who launched the attacks; Radev said responsibility was unclear. Russia denied involvement, while Zelenskyy blamed Russia for the earlier strike. Repeated attacks could disrupt maritime trade and increase risks for operators, especially those carrying Ukrainian cargo.

05

What happens to maritime trade, shipping costs, and food supplies when commercial vessels are attacked?

Attacks on commercial ships can interrupt routes, delay cargoes, and make every voyage riskier. Shipowners may reroute vessels or charge more for insurance, security, and fuel. Those costs can reach buyers through more expensive goods, especially grain and other food cargoes.

The article gives a direct example: the Togo-flagged Alfa Watan sank on October 6, while grain carrier Able was damaged. A later strike sank another vessel, and three drones hit Chelsea 3, though all 15 crew members survived. Such losses reduce shipping capacity and raise uncertainty, pushing freight and insurance prices upward.

The Black Sea carries Ukrainian grain and other commodities, so repeated attacks threaten a major supply route. They do not automatically create shortages, but delays or rerouting can tighten supplies and raise food prices. Responsibility remains disputed, while operators face higher costs and customers more volatile prices.

06

Who is responsible for protecting merchant ships in and around Bulgaria’s maritime zones?

Bulgaria is the first line of protection for merchant ships inside its territorial waters. As a NATO member, it can seek alliance support for wider regional defense. However, the article names no single agency and does not establish who launched the drones.

That uncertainty is clear after three drones struck the Maltese-flagged Chelsea 3. The Ukrainian-owned ship was 18 nautical miles offshore, and all 15 crew members survived. Another vessel sank, showing why coastal monitoring, naval security, and investigations matter.

Security concerns extend beyond territorial waters into Bulgaria’s exclusive economic zone. On October 6, the Togo-flagged Alfa Watan sank, while grain carrier Able was damaged. Until responsibility is proven, Bulgaria and NATO face pressure to improve surveillance and reassure commercial operators.

07

What is NATO, and why could attacks near a NATO member’s waters become an international security concern?

NATO is a group of countries that promise to help defend one another. It matters because violence near one member can threaten shared security, even outside territorial waters. An incident does not automatically trigger military action; facts and alliance decisions matter.

In the article, Bulgaria is a NATO member, and drones struck the Maltese-flagged Chelsea 3 about 18 nautical miles offshore. Three drones hit it, while another vessel sank and all 15 crew members were rescued. Such attacks can endanger crews, disrupt trade, and raise fears that wider conflict could reach alliance territory.

The latest incident was described as the second of its kind in one week. Prime Minister Rumen Radev said responsibility was unclear, while Ukraine blamed Russia for the earlier attack and Russia denied involvement. Investigations, careful communication, and stronger shipping protections matter because the Black Sea carries grain and other vital goods.

This brief was written by AI from the original reporting and checked by other models. Names, figures and quotes come from the source; read it for full context.

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