In brief
Three maritime drones struck the CONTSHIP JET south‑east of Shabla, Bosnia, causing the vessel to sink near Cape Kaliakra. 18 crew were rescued and Bulgarian authorities launched a detailed seawater sampling program to check for pollution from the ship’s cargo of lithium‑ion batteries and gas oil. The Maritime Administration expects no significant spill, but monitoring will continue and results will be publicly released.
Three maritime drones struck the Liberian‑flagged container ship CONTSHIP JET about 21 nautical miles southeast of Shabla on Wednesday, and the vessel sank to the bottom of the Black Sea around midnight. Immediate rescue operations brought all 18 crew members – 14 Filipinos and four Ukrainians – to Varna, where maritime and environmental authorities began a rapid assessment of any potential pollution from the ship’s hazardous cargo.
The CONTSHIP JET was carrying 421 containers, including lithium‑ion batteries and gas oil. Twenty of those containers fell overboard during the impact. While the container ship’s fuel – specifically gas oil – is expected to evaporate quickly and is not projected to reach Bulgarian shores, the cargo of batteries and other chemicals raises significant environmental concerns in case a spill occurs.
The Maritime Administration Executive Agency inspected the sunken vessel shortly after the strike and reported that the vessel’s condition posed “no significant adverse effects on the marine environment or coastline at this stage.” They also noted that the gas oil would evaporate rapidly and would not reach the coast. Nevertheless, the Agency confirmed that it would work in close coordination with the Environment and Water Ministry, continuing real‑time monitoring of the area.
On Thursday, the Environment and Water Ministry planned extensive seawater sampling along the Black Sea coast. Five coastal locations – Durankulak, Shabla, Cape Kaliakra, Byala and Sozopol – were slated for collection. The samples will be tested for petroleum products, polychlorinated biphenyls (PCBs), metals and other physicochemical indicators of water quality. An additional set of samples is scheduled around the ship’s wreck site, with analyses to be carried out at the Executive Environment Agency’s regional laboratories in Varna and Burgas.
These efforts aim to detect pollution that may not be visible during a visual inspection and to establish whether seawater quality has changed in ways that could threaten marine life and coastal communities. The results, once available, will be made public by the Ministry.
In parallel, the Defense Ministry’s initial checks at two points in Bulgarian territorial waters found no visible signs of pollution. Similarly, measurements taken near Sozopol for dissolved oxygen and other parameters showed no abnormalities. Monitoring will continue, and any change in the situation will trigger a timely response from the responsible institutions.
Beyond the environmental monitoring, the incident highlights the growing threat of maritime drone attacks in the Black Sea. The Bulgarian Prime Minister Rumen Radev reported that a French patrol aircraft had detected the drones at least half an hour before the attack, and the aircraft had indicated their heading. The donor said the crew of CONTSHIP JET had the opportunity to evacuate before the drones struck.
"The French aircraft had indicated where the drones were heading," Radev told reporters.
Admiral Emil Eftimov, Bulgaria’s outgoing Chief of Defence, noted in an interview that the drones approached from the east and remained outside Bulgarian territorial waters. He emphasized that Bulgaria has no authority to act outside its borders but has been strengthening its intelligence, surveillance and early‑warning systems and acquiring new anti‑drone capabilities.
"We are not at war. The drones did not enter territorial waters, so we did not take action," Eftimov said.
The European Commission expressed full solidarity with Bulgaria following the incident, calling the attacks an unacceptable escalation that threatens maritime security, EU interests and global trade. The Commission offered to cooperate with Bulgaria and Romania to strengthen maritime security in the Black Sea region.
Legal scrutiny is also underway. The Sofia Military District Prosecution Office opened a pre‑trial investigation into the drone attack, examining potential violations of international law governing warfare. The investigation will probe the vessel’s ownership, cargo, crew composition and the circumstances of the attack.
For the environmental community, the immediate focus remains on detecting any contamination that may arise from the ship’s cargo. The coordinated efforts of the Maritime Administration, Defense Ministry, Environment and Water Ministry and the Executive Environment Agency exemplify a multidisciplinary approach to maritime environmental crisis management. While experts anticipate no significant marine or coastal damage from the gas oil spill, the toxicity of lithium‑ion batteries and the presence of PCBs and metals in the cargo warrant thorough scientific scrutiny.
In the coming days, as sampling teams collect seawater from the five coastal sites and the wreck area, the scientific data will provide insight into whether the ship’s sinking posed an immediate or latent risk to marine ecosystems. The Path to transparency is clear: the Ministry will publish the results, allowing the global environmental community to assess the black‑sea pollution risk and to evaluate the effectiveness of Bulgaria’s maritime security posture.
As the investigation unfolds and international partners reinforce maritime security, the lessons learned from this incident will inform future response strategies for protecting the Black Sea’s delicate ecosystems while ensuring the safety of maritime commerce.
