Credits: Gordon Leggett / Wikimedia Commons — CC BY-SA 4.0.
On the night of November 27, 2025, at anchor off Dakar, the oil tanker Mersin (flagged Panama, operated by Besiktas Shipping) suffered four external explosions near the engine room. Twenty-two seafarers were evacuated with no injuries. Senegalese authorities deployed an anti-pollution plan to prevent any hydrocarbon leak. In the background, fragile energy routes and responsibilities still unclear.
What Happened During the Oil Tanker Accident on November 27, 2025
At anchor off Dakar, the oil tanker Mersin (flag Panama, owner Besiktas Shipping) was hit by four “external explosions” around 11:45 p.m. The shock caused a breach in the engine room and a stern collapse. Twenty-two seafarers, mostly Turkish, were evacuated safe and sound to the coast.
Early observations converge: no injuries, no confirmed pollution at the time, but a high risk due to the cargo and the stability of the hull. Images taken from patrol vessels and testimony from nearby crews describe a partially submerged stern after the detonations.
A Ship Laden With Russian Fuels, Immobilized Offshore
According to the owner and several technical sources, the Mersin was carrying a large cargo of fuels of Russian origin. Estimates vary: about 39,000 tonnes of gasoil, sometimes described as “more than 30,000 tonnes” or up to “50,000 tonnes” of petroleum products. Caution is warranted: these figures reflect load plan data and declarations still being consolidated.
The vessel had been at anchor for several weeks, because it could not enter the Port autonome de Dakar. Indeed, its draft was incompatible with the available berths. Departing from the Russian port of Taman (Kerch strait), it stopped its AIS signal a little over a day before the incident, according to maritime tracking data consulted by authorities.
Immediate Reaction From Senegal: Human Safety and Anti-Pollution
Upon the alert, the harbormaster and the navy coordinated an emergency response. Tugboats, a floating boom, salvage vessels and a patrol ship were deployed around the Mersin. Divers and underwater specialists inspected the hull and the engine room to contain the breach.
Authorities announced that the situation was stabilized and under continuous monitoring. No oil slick was detected during initial air and sea patrols. Meanwhile, pumping operations and a possible transshipment to another tanker are being prepared. This aims to lighten the ship and reduce environmental risk. In addition, the anti-pollution plan triggered after the oil tanker accident remains active.
Attribution Still Uncertain
The owner speaks of “external explosions.” That is, for now, the strongest point. For the rest, hypotheses coexist. Analysts mention a modus operandi reminiscent of naval drones or adhesive charges used in recent months against tankers linked to Russian oil, in the Black Sea and the Mediterranean, including attacks attributed to the Houthis in other maritime areas. Others stress the possibility of a covert sabotage, with no claim of responsibility.
No Senegalese authority has attributed the attack. Kyiv has not claimed this specific episode. On the Moscow side, diplomacy denounced an “international terrorist act” targeting its energy exports. However, this political accusation is not publicly substantiated at this stage. Local investigators must establish the exact nature of the damage. Moreover, they must reconstruct the chain of events and verify traces left around the hull.
The Facts and What We Still Don’t Know
Established: four external detonations around 11:45 p.m. on November 27, 2025; 22 seafarers evacuated; breach in the engine room; anti-pollution response activated; no injuries nor oil slick observed during initial inspections.
Uncertainties: perpetrators and motives; type of explosive or device; precise volume and detailed nature of the cargo; exact duration of prior anchorage off Dakar; AIS sequence and material traces usable.
An Episode That Exposes the Vulnerability of Energy Routes to Attacks on Tankers
The incident occurs while, in the Black Sea, tankers that transited Russian ports have been targeted. Consequently, this has driven up insurance premiums and increased vigilance among shipowners. The Mersin, although distant from the Turkish straits, fits into this growing risk climate. Indeed, these risks now extend to West African coasts. Moreover, tankers, including British vessels, have been targeted in recent days.
For insurers and charterers, each such event raises the cost of freight. It also complicates routing and encourages some companies to use fleets operating opaquely. Ports and coastal states, with Senegal at the forefront, find themselves on the front line. However, they do not necessarily have all the technical means to intervene on heavily laden ships. Furthermore, those means are often insufficient for very large vessels offshore.
The “Ghost Fleet” at the Heart of Speculation
Since 2024–2025, a constellation of older ships, often re-flagged and operating with hard-to-trace insurers and shell companies, has been transporting Russian hydrocarbons to circumvent sanctions. Numerous incidents like breakdowns, collisions, fires and losses of control have fueled the debate. Moreover, this debate concerns the systemic risk this fleet poses to maritime security and the environment.
Is the Mersin linked to this network? Clues — origin of the cargo, routes, technical stops — feed the idea that it may share characteristics. But an official categorization would require a full documentary investigation (beneficial ownership, insurance, classifications), which has not been published to date.
Environment: Between Major Risk and Precautionary Measures
A tanker carrying tens of thousands of tons of fuel off a densely populated coastline represents a major hazard. A hull rupture could contaminate beaches, mangroves and the seabed around the Cap-Vert peninsula. Moreover, a grounding would have lasting impacts on artisanal fishing, tourism and biodiversity.
Senegal’s anti-pollution plan provides for booms, suction equipment, stocks of dispersants and specialized teams. However, the effectiveness of these tools depends on the weather and distance from shore. It is also influenced by the type of product and the speed of intervention. Controlled transshipment remains a reliable lever to reduce risk. In addition, dewatering the breach remains essential.
Dakar, Oil Hub Under Pressure
The Port autonome de Dakar is a strategic node for petroleum products in West Africa. Its geography—a crossroads between Africa, Europe and the Americas—explains the number of waiting anchorages offshore. But this stopover function exposes the roadstead to ships of marginal dimensions, and therefore to risks: excessive draft, delicate maneuvers, restricted access due to swell or wind.
Since the incident, Senegalese authorities have stepped up monitoring and coordinated public and private actors: pilotage, towing, the maritime prefecture, customs and rescue services. The Mersin will remain under control until the cargo has been stabilized, lightened or transshipped.
What Stakeholders Say
Owner Besiktas Shipping reports the vessel is now “secured and stable,” under permanent surveillance, and says it is cooperating with investigators. Port authorities denounce a “major incident” but managed, with no leak detected so far. On the Russian side, the foreign ministry spokesperson, Maria Zakharova, calls it “international terrorism.” Maritime security experts underline the unprecedented nature of an attack far from the Black Sea. However, that would only hold if the military lead is confirmed.
Insurance, Maritime Law and Domino Effects
Every real or alleged attack on a tanker weighs on insurance costs and charters. War clauses can be revised in days, increasing costs on sensitive routes. For coastal states, the question touches international law: freedom of navigation, SAR (search and rescue) obligations, civil liability in case of pollution. In the short term, the priority remains to prevent an oil spill. In the medium term, it is to avoid West African coasts becoming a new theater of proxy armed friction.
Remaining Questions
Who has an interest in striking a tanker anchored off Dakar? Is West Africa becoming a secondary front of the war in Ukraine? What guarantees will ports and insurers now require from ships carrying Russian hydrocarbons? Beyond that, what additional capabilities will need financing to secure increasingly crowded waiting anchorages?
A Provisional Summary
Beyond the spectacle of the night scene, there are four detonations and a collapsed stern. Furthermore, beacons cut through the swell, and the Mersin episode underscores an obvious point. Indeed, the energy routes are exposed. Moreover, coastal states pay the cost of risk first. Dakar reacted quickly, protected human lives and activated its environmental defenses. The investigation will have to determine whether the Russia-Ukraine war has really spilled over to Cap-Vert. If not, it could be an operation by another actor. It could also be a method still little known. Meanwhile, the ship remains under guard, and the coast is on high alert.