The bulk carrier "Tolunay", Cook Islands flagged 158 meters ship, collided with the Turkish Coast Guard boat "SG-25" in the Bosphorus, on Aug 17 in the morning at 08:20 local time (+3 GMT) , while proceeding in northern direction.
The Coast Guard boat was escorting to a Russian warship at the time of accident. Both were proceeding towards same direction.
The accident took place just in front of Haydarpaşa Port Breakwater.
The "SG-25" capsized. Of the seven crew members on board. six were rescued, three of them lost their lives, one man remained missing.
The "SG-25" sank with the bos still above the water.
The "Kıyı Emniyeti 3" 4 Hızlı", "Tahlisiye Botları", "Kurtarma 1" and "8 Römorkörleri" weere on site. The"Tolunay" anchored at Buyukdere for investigation.
The vessel was en route from Casablanca to Odessa.
Turkish maritime news site "DenizHaber.Com" published the accident video after the accident. On the video, the moment of collision was seen clearly.
An expert commented saying the reason of accident was due to positive hydrostatic force created by the large ship's bow, pushing the stern of Coast Guard boat and making her rapidly and uncontrollably turn to port side and then the ship's bulb made her to capsize in seconds.
Accident video is below.