A container vessel hit by three maritime drones east of Cape Kaliakra sank around midnight on Wednesday 29 October 2026, BTA reports. The ship carried lithium‑ion batteries and all 18 crew members were rescued and taken to Varna. The Varna Regional Administration confirmed the incident, a confirmation echoed by Traffic Control and the Maritime Administration Executive Agency.
Defence Ministry teams collected seawater samples from two sites within Bulgarian territorial waters. Their inspection revealed no visible signs of pollution, BTA cited. This marks the fifth drone attack in Bulgaria’s exclusive economic zone since the start of October, the outlet added.
Planned Seawater Sampling and Analysis
On Thursday, the Black Sea Basin Directorate and the Executive Environment Agency will conduct further seawater sampling at five coastal locations: Durankulak, Shabla, Cape Kaliakra, Byala and Sozopol, as stated by the Environment and Water Ministry. The collected samples will be tested for petroleum products, polychlorinated biphenyls (PCBs), metals and other physicochemical indicators of water quality. The Executive Environment Agency’s regional laboratories in Varna and Burgas will carry out the analysis.
In addition to the coastal samples, the agency plans sampling around the area where the container ship sank. The aim is to determine not only whether pollution is present but also whether changes in seawater quality that cannot be detected through visual inspection exist, the ministry added. The Environment and Water Ministry and other competent authorities will continue inspections and monitoring. The results will be made public, the ministry further noted.
While the Defence Ministry’s preliminary survey found no visible pollution, the full laboratory tests will reveal whether any contaminants, including those that might leach from lithium‑ion batteries, have entered the marine environment. The ongoing monitoring also reflects concerns that further drone attacks could threaten maritime safety and ecological health in Bulgaria’s waters.
Ongoing uncertainty remains over whether the laboratory results will detect any subtle changes in seaward quality and whether such findings could indicate a broader pattern of pollution or other environmental impacts from the drone incident.
