A maritime collision in the Marmara Sea triggered a major Turkish search-and-rescue effort on the event date of September 2, 2026, after a cargo ship carrying rolled steel sank and all 10 crew members aboard were reported missing.
According to Turkish officials cited by Euronews, the accident happened before dawn about 18 nautical miles, or 33 kilometres, off Silivri on the western edge of Istanbul province. The vessels involved were the Tuğberk İmamoğlu, a dry cargo ship loaded with 4,200 tons of rolled sheet metal, and the ALSU, which authorities later said was an empty oil tanker. The cargo ship reportedly went down shortly after the collision, leaving rescuers racing to locate its crew.
The maritime directorate said concern escalated when the Tuğberk İmamoğlu stopped responding to radio calls and crew members could not be reached on their mobile phones. The ALSU's captain reported that the collision occurred at 3:15 a.m., giving officials an initial timeline for the emergency response. Turkish authorities then dispatched 14 search-and-rescue vessels and a helicopter to the area, turning the sea west of Istanbul into the center of a broad recovery and survival operation.
Officials said life-saving equipment from the missing ship was found floating at sea, including a lifeboat belonging to the Tuğberk İmamoğlu. That discovery sharpened fears about the fate of the crew because, according to the report, none of the missing sailors were inside the boat when it was recovered. The ALSU, though damaged in the collision, also joined the rescue effort. The available evidence did not describe how severely the tanker was hit, but it made clear that the vessel remained afloat and operational enough to assist in the search.
The official account also shifted on one operational detail: the maritime directorate initially said the ALSU had been carrying 3,000 tonnes of motor oil, then later said the tanker was empty, a point Euronews reported was confirmed by the governorate. That clarification matters because it narrowed the immediate concern to the human toll and marine navigation emergency rather than a confirmed fuel-spill disaster. Even so, the sinking of a steel-carrying cargo ship in a busy waterway underscored the risks attached to pre-dawn shipping traffic near one of the region's largest urban and commercial hubs.
The accident came only three days after another deadly maritime disaster involving Turkish nationals, this time off Turkish-occupied northern Cyprus, where rescuers were still searching for additional missing people. While the two incidents were unrelated in the evidence packet, their proximity highlighted a grim run of maritime emergencies for Turkish authorities and rescue services.
For now, the central unanswered question remained whether any of the 10 crew members from the Tuğberk İmamoğlu survived the sinking. Based on the supplied report, officials had located debris and safety equipment but not the sailors themselves. The search area, the early-morning timing of the collision and the rapid loss of contact with the cargo ship all pointed to a difficult rescue environment. What Turkish authorities had established by the event date was stark: a loaded cargo vessel had vanished beneath the Marmara Sea after colliding with another ship, and a full-scale operation was underway to find the people who had been on board.
