Most tankers crossing Hormuz now sail with their transponders off, and the world's oil counters cannot see what they are counting

Two things are true at once in the Strait of Hormuz, and they cannot both survive the autumn. Donald Trump says the strait is open and under American control, while Tehran says it is closed to any ship that has not asked permission, and the United States Navy is running a blockade against Iran-linked vessels at the same time (Al Jazeera, Aug 20). Between those two claims sits the actual traffic, and the actual traffic has stopped identifying itself. Of 112 ships carrying crude, LPG and LNG through the strait between August 1 and August 19, only 21 openly used Iran's coastal route and just two formally used the Omani route Washington insists on; the other 89, more than 80 percent, went dark or took routes nobody can confirm (Al Jazeera, citing Kpler data, Aug 20). The world's most important oil valve is functioning, but off the record.

The actors want incompatible things. Iran wants every hull to hug its coast past Larak and Qeshm Islands, both because it collects leverage from the traffic and because sanctioned cargo slips into Iranian ports along that line. Washington wants ships on the southern Omani route under naval protection, so it can claim the waterway works without Tehran. Oman wants to be paid as the indispensable host and nearly struck its own management deal with Iran before Trump threatened to bomb a US ally to stop it (Al Jazeera, Aug 20). The shipowners, caught underneath, want one thing above all: not to be the next missile story.

Their fear has arithmetic behind it. ADNOC said this month that fifteen of its vessels have been attacked by missiles or drones since the war began in late February, killing one crew member and wounding twenty (Al Jazeera, quoting ADNOC statement, Aug 20). In July the US fired Hellfire missiles at an oil tanker heading for Kharg Island after it ignored warnings, and on August 11 a Navy helicopter fired two more at the Panama-flagged Vela Nova for trying to run the blockade of Iranian ports (Al Jazeera, Aug 20). A transponder signal tells both militaries exactly where you are and which rules you are breaking, so operators conclude the cheapest armor is silence. Marine insurers now price war-risk cover for a Hormuz transit at 7.5 percent to 12.5 percent of a vessel's value, per voyage (Ajel English, reporting Gulf marine insurance sources, Aug 19).

The trigger this month was the collapse of the truce paperwork. The 60-day window opened by the June 17 memorandum expired on August 17 with no successor agreement and no active diplomatic channel, and weekly transits counted by Lloyd's List Intelligence fell to 73 in the week of August 10-16 from 91 the week before, against a pre-war baseline near 130 a day (Global Energy Flow tracker, Day 175, citing Lloyd's List Intelligence, Aug 22). The pressure underneath is older: since the strait was closed in early March, both sides have bombed ships they accuse of violating their rules, and each strike taught every owner the same lesson about switching the box off. Darkness did not spread because someone ordered it. It spread because it worked.

Kpler's audit of crude-loaded tonnage shows how complete the retreat into silence has become: 72 of 84 crude-laden tankers that transited since July 7, 86 percent, sailed dark, mostly through the UN-sanctioned Omani corridor (Global Energy Flow tracker, citing Kpler, Aug 22). Some of those blacked-out crossings are Gulf states quietly moving oil, including Saudi, Iraqi and Kuwaiti cargoes doing ship-to-ship transfers outside the strait so the receiving vessel, not the dark ship, shows up at the destination port (Al Jazeera, quoting energy researcher Marc Ayoub, Aug 20). Others are Iranian barrels laundered through Oman, documents redrawn so the cargo appears Omani before it reaches the market (Al Jazeera, Aug 20). The same trick serves the smuggler and the national oil company, which is precisely why the tracking firms can no longer tell them apart.

A fifth of the world's oil now moves through the world's most watched chokepoint wearing a blindfold, and the watchers have learned to sell the guesswork.

The history that fits is the Tanker War of the 1980s, when Iranian and Iraqi attacks in this same water drove Kuwait's fleet to reflag under the American banner and sail under Navy escort in Operation Earnest Will. That episode ended with more visibility, not less: flagged convoys, announced schedules, insurers able to name what they were covering. This time the movement runs the other way, toward erasure, because no navy can escort today's traffic volume and neither belligerent wants the flow verified, only routed. The counter-example argues the optimists' case: even through those years of hulls burning in the Gulf, oil never stopped moving and prices eventually settled. But those tankers stayed visible while they burned. Today's cross in silence, and what cannot be seen cannot be confirmed safe.

Follow who pays. Asian refiners buying Gulf crude are paying a visibility premium twice over, once in freight and war-risk surcharges and once in wider discounts demanded for barrels whose origin and volume nobody will certify. The oil market itself pays in volatility: Brent settled around $93.40 on Friday, up more than 5 percent on the week, on a supply picture that official trackers concede they cannot fully observe (Global Energy Flow tracker, Aug 22). Whoever holds verified physical intelligence profits: the satellite imagery firms now selling dark-hull detection, the ship-to-ship transfer brokers off Muscat and Fujairah taking a cut of every invisible barrel, and traders with port agents on both coasts of the Gulf who know what AIS does not show. The retail holder of an oil ETF owns none of that edge and all of the whipsaw.

The consequence after that lands on safety, not commerce. A strait where six out of ten ships broadcast nothing is a strait where collision avoidance, search-and-rescue and de-mining all lose their eyes, and the central deep-water channel is still seeded with roughly 80 mines that will take 40 to 50 days to clear whenever anyone agrees to clear them (Global Energy Flow tracker, Aug 22). Washington plans an "economic D-day" sanctions package for Monday, August 24, aimed at banks, shipping registries and smuggling networks (Global Energy Flow tracker, Aug 22), which will push still more traffic into the dark rather than back onto the charts. Every enforcement action inside a blackout teaches owners the same skill: how to disappear better.

What would confirm this read is the count going the wrong way: Lloyd's List Intelligence weekly transits falling below 60 while Brent pushes through $100 on unverifiable flows. What breaks it is an enforced corridor deal, either the Iran-Oman arrangement revived or a US-escorted convoy schedule, that puts named, insured hulls back on the open route in daylight, with dark-share dropping below a quarter of transits within weeks.

The people absorbing this are the twenty-person crews who steam the world's most dangerous fifty miles of water with their radios off, one crewman already dead and twenty wounded among ADNOC's fleet alone. The judgment the numbers force is uncomfortable for everyone: the world's mightiest navy controls the strait on paper, Tehran's missiles frighten captains more than Trump's do, and the true flow of a fifth of the planet's oil is now known only to the men who carry it.