​​​This information is preliminary and subject to change.

​​On March 10, 2025, the 601-foot-long United States-flagged tanker Stena Immaculate, with a cargo of A1 jet fuel, was anchored about 13 nautical miles off the coast of Withernsea, United Kingdom. About 0948 local time (Greenwich mean time) the 461-foot-long Portugal-flagged containership Solong collided with the anchored tanker. Both the Stena Immaculate and the Solong caught fire, and after attempting to fight the fire, the crews of the two vessels abandoned ship. One crewmember of the Stena Immaculate sustained minor injuries. One crewmember of the Solong was fatally injured. No pollution was reported. Damages are expected to exceed $500,000.

The US Coast Guard has declared this incident a major marine casualty. Under the International Maritime Organization (IMO) Code of International Standards and Recommended Practices for a Safety Investigation into a Marine Casualty or Marine Incident (Casualty Investigation Code), the flag and coastal state have authority to investigate. As the coastal state where the casualty occurred, the United Kingdom’s Marine Accident Investigation Branch (MAIB) will produce a report of the investigation.​ Following the practices in the IMO Casualty Investigation Code, the NTSB and the Coast Guard will have the opportunity to review and provide comments on the draft MAIB report. The MAIB will consider any suggested recommendations from the Coast Guard and the NTSB. The NTSB will post the final MAIB report in the docket.

For this investigation, the US Coast Guard is the lead investigative agency for the United States. The NTSB will produce an investigation close-out memorandum, which can be found in our docket.