For more than two months, a rusting Suezmax tanker has sat wedged against the rocks of Al Qibliyyah, one of Oman's Hallaniyat Islands, slowly emptying nearly a million barrels of Russian crude into a marine reserve that's home to humpback whales and rare seabirds. On Monday, Omani authorities confirmed what satellite trackers had been reporting for weeks: the slick has grown to roughly 390 square kilometers, an area bigger than the island of Malta.
Tanker groundings happen. What's notable here is the response, or lack of one. Weeks after the vessel radioed a distress call reporting a suspected explosion off Yemen on June 8, its registered owner, a China-based firm called Rentoor Shipmanagement, still hasn't answered Omani directives to remove the wreck. No insurer has come forward to fund cleanup work. No government or shipping body has claimed responsibility for whatever caused the blast in the first place.
The Caroline Bezengi is a 274-meter, 160,000-deadweight-ton Suezmax built in 2001. It's old for a tanker, and it belongs to what shipping analysts call Russia's "shadow fleet": vessels that move sanctioned crude while obscuring ownership through flag-hopping and shell-company management structures. The ship loaded Russian crude at the Black Sea port of Novorossiysk in April, transited the Suez Canal in late May, and was sailing off Yemen bound for Asia when its crew reported the suspected blast on June 8. It later ended up grounded on rocks off Oman's Dhofar coast.
It flew the Cameroon flag, but Cameroon's registry delisted the vessel along with 38 others in June. It's now sanctioned by the European Union, the United Kingdom, Canada, Ukraine and Switzerland over its role in Russian oil exports. Its registered owner and manager, Rentoor Shipmanagement and Villar Shipmanagement, both appear to be based in China, according to shipping data reported by Reuters, and neither has responded to attempts to reach them.
Maritime analysts writing for The Maritime Executive point out that it's common for tankers in Russia's dark fleet to carry no real insurance, or to circulate fabricated certificates that satisfy port paperwork without providing any actual financial backing behind them. If that's what happened here, it explains a lot about why nobody has taken charge of the cleanup.
Normally, a spill like this would trigger a fairly predictable financial process. The vessel's Protection & Indemnity (P&I) club - one of the mutual insurers under the International Group of P&I Clubs, which by its own account covers around 87% of the world's ocean-going tonnage - would fund pollution response, wreck removal and third-party claims, backed by pooled reinsurance that can extend up to $1 billion per incident for oil pollution specifically.
Russian-linked tonnage has largely been pushed out of that system. Western P&I clubs have progressively withdrawn from insuring vessels tied to sanctioned Russian oil trade since 2022, a shift Insurance Business America has covered as the gap gets filled by thinly capitalized, often opaque alternative insurers with little real ability to pay a major claim. A separate Insurance Business report on a different detained shadow-fleet vessel earlier this year made much the same point: coverage that looks legitimate on paper and coverage that can actually pay a large claim are no longer the same thing once a ship falls outside the International Group framework.
Asia Sentinel reporting on Russia's insurance workarounds describes a shadow fleet of an estimated 600 to 900 vessels leaning increasingly on domestic Russian insurers and state-backed reinsurance vehicles that sit entirely outside the P&I pooling system. On paper, these provide liability protection. In practice, most can't cover more than a fraction of what a major spill costs.
Without a solvent insurer or a cooperative owner, the financial burden falls on the coastal state. Oman's Environment Authority has said it sees no immediate threat to desalination plants or tourist facilities, but the country is still coordinating an aerial dispersant and boom operation largely at its own expense.
Estimates of the spill's true extent have varied widely over the past month. Greenpeace Germany put it at roughly 600 square kilometers in early August; the Dutch conflict-pollution watchdog PAX estimated as high as 800 square kilometers around the same time, before winds and currents appeared to disperse part of the slick. PAX's tracking, cited by the Associated Press via Fox News, has also warned that monsoon swells could split the hull entirely, turning a bad spill into a much worse one.
The discrepancies come down to different satellite passes, sensors and analytical methods, and to how fast a visible sheen changes with weather. Edinburgh's Heriot-Watt University professor Tony Gutierrez, an environmental microbiologist, has drawn the comparison to Exxon Valdez: oil that reaches shallow water or coral, he's noted, can still turn up in sediment decades later. If that happens here, the cleanup costs - plus any claims tied to fisheries, tourism or wildlife habitat - will have nowhere obvious to land, because there's no solvent insurer, P&I club or cooperative shipowner in the picture.
The marine insurance market has flagged this kind of scenario before. An analysis distributed by broking firm Miller, covered by Insurance Business's Asia and UK titles, pointed to rising ship-to-ship transfer volumes and increasingly sophisticated ownership concealment as early signs that a shadow-fleet casualty with no credible insurer attached was coming sooner or later.
The Caroline Bezengi is one ship, but the pattern behind it is big enough to matter to reinsurers well beyond this single claim. Estimates of the shadow fleet's overall size vary by methodology and by which sanctioned countries get counted - S&P Global puts it at roughly 17% of the global oil tanker fleet, other trackers put it closer to one in five - but most analysts agree the fleet has more than doubled in size since Russia's 2022 invasion of Ukraine. Each of those vessels is carrying a policy of some kind, real or fabricated, that may eventually be tested.
For underwriters and reinsurers with exposure to tanker war risk, pollution liability or charterers' liability, this incident raises a few concrete questions already surfacing in renewal talks: how carefully are counterparties screening a vessel's insurance stack before chartering or accepting cargo? Has claimed P&I cover actually been checked against the International Group's member list? And how much of an insurer's book depends on a policyholder who might simply not answer the phone when a claim comes in?
There aren't clean answers to any of those yet. But the industry's usual assumption - that somebody, eventually, pays for a major spill - is being tested off the coast of Oman right now.
