On the night of November 27, 2025, anchored off the coast of Dakar, the tanker Mersin (flagged Panama, operated by Besiktas Shipping) experienced four external explosions near the engine room. Twenty-two sailors were evacuated without injuries. Senegalese authorities deployed an anti-pollution plan to prevent any hydrocarbon leaks. In the background, energy routes are weakened and responsibilities remain unclear.
What happened during the oil tanker accident on November 27, 2025
Anchored off the coast of Dakar, the tanker Mersin (flagged Panama, owned by Besiktas Shipping) was hit by four "external explosions" around 11:45 PM. The shock caused a breach in the engine room and a stern sagging. Twenty-two sailors, mostly Turkish, were evacuated safely to the shore.
Initial observations converge: no injuries, no confirmed pollution at the time of the incident, but a high risk due to the cargo and the stability of the hull. Images taken from patrol boats and testimonies from nearby crews describe a partially submerged stern after the detonations.
A ship loaded with Russian fuels, immobilized offshore
According to the owner and several technical sources, the Mersin was carrying a significant cargo of Russian-origin fuels. Estimates vary: about 39,000 tons of diesel, sometimes described as "more than 30,000 tons" or up to "50,000 tons" of petroleum products. Caution is advised: these figures reflect loading plan data and declarations still being consolidated.
The ship had been anchored 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 interrupted its AIS signal a little over a day before the incident, according to maritime tracking data consulted by the authorities.
Immediate reaction from Senegal: safety of human lives and anti-pollution
Upon alert, the harbor master and the national navy coordinated an emergency response. Tugboats, a floating barrier, rescue ships, and a patrol boat 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 surveillance. No oil slick was detected during the initial aerial and maritime rotations. Meanwhile, pumping operations and a possible transfer to another tanker are being prepared. This aims to lighten the ship and reduce environmental risk. Additionally, the anti-pollution plan triggered after the oil tanker accident remains active.
An attribution still uncertain
The owner speaks of "external explosions." This is, for now, the most solid 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 insist on the possibility of clandestine sabotage, without any claim.
No Senegalese authority has attributed the attack. Kyiv has not claimed this specific episode. On the Moscow side, diplomacy denounced an "act of international terrorism" 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 the clues left around the hull.
The facts and what we still don’t know
Established: four external detonations around 11:45 PM on November 27, 2025; 22 sailors evacuated; breach in the engine room; anti-pollution device triggered; no injuries or oil spill observed during the initial inspections.
Uncertainties: perpetrators and motivations; type of explosive or device; precise volume and detailed nature of the cargo; exact duration of the previous anchorage off Dakar; sequence of sensors (AIS) and exploitable material traces.
An episode that exposes the vulnerability of energy routes to attacks on tankers
The incident occurs while, in the Black Sea, tankers having transited through Russian ports have been targeted. Consequently, this has led to an increase in insurance premiums and heightened vigilance among shipowners. The Mersin, although distant from the Turkish straits, fits into this climate of growing risks. Indeed, these risks now extend to the West African coasts. Moreover, tankers, including British ships, have been targeted in recent days.
For insurers and charter parties, each such event increases the cost of freight. Additionally, it complicates routes and encourages some companies to resort to fleets operating in opacity. 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 loaded ships. Furthermore, these means are often insufficient for large ships offshore.
The "ghost fleet" at the heart of speculations
Since 2024–2025, a constellation of old ships, often re-registered and operating with insurances and shell companies difficult to trace, transports Russian hydrocarbons by circumventing sanctions. Numerous incidents such as breakdowns, collisions, fires, and losses of control have fueled the debate. Moreover, this debate concerns the systemic risk posed by this fleet to maritime safety and the environment.
Is the Mersin linked to this nebulous network? Clues — origin of the cargo, routes, technical stops — suggest it might share characteristics with it. But an official categorization would require a complete documentary investigation (actual ownership, insurance, classifications), which has not been published to date.
Environment: between major risk and precautionary measures
A tanker loaded with tens of thousands of tons of fuels off a densely populated coastline represents a major hazard. A hull breach could pollute the beaches, mangroves, and seabeds around the Cape Verde Peninsula. Moreover, a grounding would have lasting impacts on artisanal fishing, tourism, and biodiversity.
The Senegalese anti-pollution plan includes barriers, suction means, stocks of dispersants, and specialized teams. However, the effectiveness of these tools depends on the weather and the distance to the coast. Additionally, it is influenced by the type of product and the speed of intervention. Controlled transshipment remains a safe lever to reduce risk. Furthermore, decommissioning the breach is also essential.
Dakar, oil hub under pressure
The Port autonome de Dakar is a strategic node for petroleum products in West Africa. Its geography — crossroads between Africa, Europe, and the Americas — explains the number of waiting anchorages offshore. But this stopover function exposes the harbor to ships with borderline dimensions, and thus to risks: excessive draft, delicate maneuvers, access constrained by swell or wind.
Since the incident, Senegalese authorities have reinforced monitoring and coordinated public and private actors: piloting, towing, maritime prefecture, customs, and rescue services. The Mersin will remain under control until the cargo is stabilized, lightened, or transferred.
What the stakeholders say
The owner Besiktas Shipping reports a ship now "secured and stable," under permanent surveillance, and claims to cooperate with the investigators. The port authorities denounce a "major incident" but controlled, with no leak detected at this stage. On the Russian side, the spokesperson for the Ministry of Foreign Affairs, Maria Zakharova, mentions "international terrorism." Maritime security experts highlight the unprecedented nature of an attack far from the Black Sea. However, this would only be true if the military angle is confirmed.
Insurance, maritime law, and domino effect
Each real or supposed attack on a tanker affects insurance costs and charters. War clauses can be revised in a few days, increasing the cost of sensitive routes. For coastal states, the issue touches on international law: freedom of navigation, SAR obligations (search and rescue), civil liability in case of pollution. In the short term, the challenge remains to prevent an oil spill. In the medium term, it is about avoiding the West African coast becoming a new theater of proxy armed frictions.
The questions that remain
Who has an interest in striking a tanker immobilized off Dakar? Is West Africa becoming a secondary front in the war in Ukraine? What guarantees will ports and insurers now require from ships carrying Russian hydrocarbons? Beyond that, what additional capacities will need to be funded to secure increasingly busy waiting anchorages?
As a provisional assessment
Beyond the spectacular night scene, there are four detonations and a sagging stern. Moreover, beacons cut through the swell, and the Mersin episode reminds us of an obvious fact. Indeed, energy routes are exposed. Moreover, coastal states pay first the price of risk. Dakar reacted quickly, protected human lives, and activated its environmental defenses. The investigation will have to determine if the Russo-Ukrainian war has truly spilled over to Cape Verde. Otherwise, it could be an operation by another actor. Moreover, it could be a still unknown process. Meanwhile, the ship remains under guard, and the coast under high vigilance.