Two commercial vessels were struck by drones in Bulgaria’s exclusive economic zone early on Tuesday, 6 October, in the first known attack of its kind on merchant shipping in Bulgarian waters.
The Togo-flagged ALFA WATAN suffered severe structural damage and sank, while the Palau-flagged ABLE caught fire. Bulgarian Prime Minister Rumen Radev said the vessels were attacked at around 3am by both aerial and maritime drones about 70 nautical miles east of the coastal town of Byala. The Bulgarian government said a search-and-rescue operation was continuing for the crew of the ALFA WATAN, whose fate remained unknown.
All 18 people aboard the ABLE were rescued after abandoning the burning vessel. The Bulgarian-flagged passenger and freight ferry DIOSCURIA was diverted to the area and initially took the crew on board before Bulgarian Navy and Border Police vessels transferred them towards Varna.
The crew comprised 11 Turkish and seven Indian nationals. Two sailors were taken to hospital, including an Indian crew member suffering from burns and the Turkish captain, who sustained a head injury. Bulgarian public broadcaster BNT reported that the remaining 16 sailors subsequently arrived safely in Varna for medical checks.
The ABLE was reportedly carrying grain towards Istanbul. The cargo aboard the ALFA WATAN, which had been heading north towards Romania, has not been officially established.
Radev convened an emergency meeting involving the ministries of defence, interior, transport and environment, alongside the presidency and Bulgaria’s security services. He described the attack as an unacceptable violation of international and maritime law and warned of its effect on commercial navigation in the Black Sea.
Bulgarian authorities have not publicly identified who launched the drones. Investigations are examining both the weapons used and the circumstances surrounding the attack. One rescued Turkish sailor told Bulgarian television that he believed the ABLE had been hit by a Russian underwater drone, but that account has not been independently established and Sofia has made no formal attribution.
Foreign Minister Velislava Petrova said Bulgaria was in contact with its European and NATO partners and described Black Sea security as inseparable from wider European security. She said civilian crews and freedom of navigation must be protected and that Bulgaria would work with its allies to assess the wider consequences for maritime security.
European Commission President Ursula von der Leyen also condemned attacks against civilian shipping, saying the situation in the Black Sea was becoming increasingly concerning. She said commercial vessels and their crews were being targeted as investigations continued into the latest incidents.
Tuesday’s attack came less than 24 hours after another commercial vessel caught fire and sank in Romania’s exclusive economic zone. The Turkish-owned Royad Mammadov, sailing under the flag of Saint Kitts and Nevis, had left the Ukrainian Danube port of Izmail carrying corn for Ravenna in Italy.
Romanian authorities confirmed that two people died and 11 crew members were rescued. President Volodymyr Zelenskyy said the vessel had been struck by two Russian drones, although Romanian authorities did not themselves publicly attribute the incident to Russia.
The two incidents in consecutive days mark a further geographical expansion of the risks facing commercial shipping in the western Black Sea. EU Today has previously reported how strikes near Romania have moved maritime war risks closer to NATO territory, while a separate maritime drone explosion at Constanța raised questions over the ability of coastal states to detect and respond to unmanned systems approaching commercial infrastructure.
The distinction between territorial waters and an exclusive economic zone remains important. The attacks occurred outside Bulgaria’s territorial sea and therefore do not amount simply to an attack on Bulgarian territory. They nevertheless took place in an area where Bulgaria has internationally recognised economic rights and responsibilities, including search-and-rescue and environmental obligations.
The immediate concern for Sofia is the search for the missing crew of the ALFA WATAN and the possibility of pollution from the wreck. The wider concern for the EU is the increasingly exposed position of civilian shipping routes linking Ukraine, Romania, Bulgaria and Turkey.
Ukraine’s maritime export routes remain particularly important for agricultural trade. Repeated attacks on merchant vessels can increase insurance premiums, discourage shipowners from entering the region and raise transport costs even when ports themselves remain operational. Russian attacks on Odesa and its export infrastructure have already placed Ukraine’s Black Sea grain corridor under sustained pressure.
With merchant ships now struck in the economic zones of both Romania and Bulgaria on consecutive days, Black Sea maritime security has moved further onto the agenda of EU and NATO governments along the western coast.
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