Most tankers now cross the Strait of Hormuz dark, invisible, and uninsured

More than eighty percent of the tankers moving through the Strait of Hormuz this August have switched off their transponders, making every vessel a ghost. Kpler counted 236 ships crossing between August 1 and August 19, and of the 112 carrying crude, LPG or LNG, the great majority traveled dark, figures Al Jazeera cited on August 20.

A fifth of the world’s oil is now passing through a corridor that both Donald Trump and Iran claim to control in entirely different ways. Reuters, via US News, reported on August 18 that Trump insists the strait is open and “a lot of boats are coming through,” while Iran declares it shut. Both governments are describing a waterway that no longer exists.

The current trigger is the war between Israel, the United States and Iran, which has turned the Gulf into a shooting gallery for tankers. Ships go dark because a visible transponder makes a target, and the New York Times reported on August 21 that both Iranian patrol craft and Ukrainian-style drone operators read AIS broadcasts as targeting data.

The deeper pressure predates the war. Since 2022, Western sanctions on Russian, Iranian and Venezuelan crude have built a parallel merchant marine: old tankers reflagged to obscure registries and insured by unfamiliar companies—measures designed to move oil without a record, as Army Recognition reported in 2026. The war simply gave the dark fleet a fresh excuse.

Iran wants leverage over the waterway and revenue from crude that only moves covertly. Kpler’s figures, cited in the Ronin Group US-Iran summary of August 19, put its exports down to 156,000 barrels a day as buyers wait out the chaos.

Washington, facing election season, wants oil flowing and prices quiet—hence the White House talking up traffic while Tehran talks it down.

The shipowners, often anonymous holding vehicles in Dubai, Hong Kong and the UAE, want freight rates that have gone vertical.

The insurers, led by Lloyd’s of London syndicates, want nothing to do with any of it. Euronews reported on March 1 that war-risk premiums for a Gulf voyage jumped from about 0.02 to 0.05 percent of hull value before this year to 0.5 percent or more since late February, and the Eastern Herald, on July 24, cited single-voyage coverage at $21 million.

The Caroline Bezengi bleeds

The silence turns physical where one hull already failed. The shadow-fleet tanker Caroline Bezengi, already under sanction, exploded in June and ran aground off Oman. gCaptain reported on August 13 that Ambrey has mounted an international salvage operation. Arab News added on August 15 that the oil sheen from the wreck spread from about 20 square kilometers on July 24 to roughly 600 by mid-August.

John Amos, who leads the satellite-monitoring group SkyTruth, warns that spilling the remaining cargo could mean a 40 to 50 million-gallon disaster on the scale of Exxon Valdez and on the doorstep of a protected Arabian Sea reserve: SkyTruth via Fleetleaks, August 13. This is the shape of a fleet without insurance, without tracking, without accountability—when one hull fails, nobody is contractually obligated to clean it up, so everybody waits.

In the Tanker War of the 1980s, Iran and Iraq attacked each other’s shipping for eight years, but the world’s answer ran opposite to today: navies escorted, Kuwaiti tankers were reflagged American, and visibly broadcasting was required for protection, as with Operation Earnest Will. Now that guarantee is gone, so visibility itself is the hazard.

What is different is scale and direction. In the 1980s darkness was the weapon of the weak side; today it’s the default for the whole trade. The counterexample is the Red Sea: when Houthi missiles began hitting ships, most owners left transponders on and routed thousands of extra miles around the Cape of Good Hope, paying for visible safety. In Hormuz, there is no Cape; darkness is the only lane left.

Who pays, who profits

Charterers feel the money first. VLCC rates from the Gulf quadrupled early in the crisis, touching roughly $800,000 a day—figures Howden Re reported via Atlas Analysis in 2026—a cost that lands in every barrel Asia’s refineries lift.

London underwriters have repriced the region, and Morningstar DBRS warns that reinsurers with large Gulf books face credit pressure if war keeps driving premiums toward one percent of hull value, according to Beinsure in 2026.

Taxpayers carry the next layer. When an uninsured wreck like the Caroline Bezengi bleeds into Omani waters, the salvage and environmental bills land with governments and nonprofits because the owners are shells and the insurers are letterheads, as the New York Times reported on August 12. Fuel buyers pay in; owners with tonnage cheap enough for these routes profit.

The deeper risk is informational. Kpler still reconstructs dark passages by pairing satellite radar with port records—Lowdown explained in 2026 that this is how it counts what AIS hides—but the margin of error rises with every unlit hull. Two tankers colliding in a 21-mile-wide strait full of ghosts is not a tail risk anymore, and the New York Times reports fears of collision are mounting because location devices stay off. A spill or collision closing one traffic lane would hurt oil prices more than any minister’s threat, because it would be an unforecast accident, and uninsurable.

Kpler publishes the dark share every week, settling the argument. If it rises past ninety percent while official transit counts fall, the ghost fleet is consolidating, and Hormuz’s formal capacity is quietly dying. Oman is just as critical. If the Caroline Bezengi ruptures and SkyTruth’s satellite numbers spike, the cleanup story goes global in days.

History says two things would break this. A durable ceasefire restoring naval escorts would let owners switch transponders back on; a plunging dark share would mean fear had driven darkness. American or British convoys guaranteeing lit passage would flip the economics overnight, since insurance and escort would let honest tonnage undercut the dark fleet.

The people absorbing this shift are not traders watching Brent. They are Filipino and Indian crews on unlit ships off a warring coastline, Omani fishermen watching a black tide approach their reserve, and Asian refinery towns now fed by vessels uninsured and unescorted. The world’s oil supply has not stopped.

It has simply stopped announcing itself, and history says that is always the stage before something worse than a price spike.