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Iran Detains ‘Ocean Koi’ Tanker Apparently Hauling Iranian Oil

8 May 2026

Iran said it seized a tanker in the Gulf of Oman, which appeared to be a sanctioned vessel carrying the Islamic Republic’s own oil.

The Marshall Islands-flagged tanker Ocean Koi was recently seized by Iranian authorities in the Gulf of Oman, marking a significant escalation in regional maritime tensions. Reports indicate the vessel was allegedly transporting sanctioned Iranian crude oil, drawing immediate scrutiny from international monitoring agencies. This incident highlights the ongoing complexities surrounding illicit ship-to-ship transfers and the evasion of global trade restrictions. For seafarers operating in the Middle East, the detention of the Ocean Koi underscores the volatile nature of current tanker transit routes.

This seizure raises critical questions regarding compliance with the IMO’s International Safety Management (ISM) Code and the requirements set forth in SOLAS Chapter XI-2, which governs maritime security. Compliance departments must ensure that vessels strictly adhere to the International Ship and Port Facility Security (ISPS) Code to mitigate risks associated with sanctioned cargo. Furthermore, under MARPOL Annex I, documentation regarding cargo origin and vessel tracking remains paramount. Failure to maintain transparent records can lead to severe legal repercussions, insurance invalidation, and potential detention by regional port state control authorities.

Masters and navigating officers must exercise extreme vigilance when operating in the Gulf of Oman and the Strait of Hormuz. These officers should prioritize rigorous AIS monitoring and verify all cargo manifests against current sanctions lists to avoid accidental involvement in illicit trades. It is essential for bridge teams to maintain updated security protocols and report any suspicious vessel movements to their company security officer immediately to ensure the safety of the crew and the vessel's operational integrity.

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