Washington declared the strait de-mined on Tuesday. Two hours later, Iran and Oman agreed to clear the mines

The all-clear has now been issued twice in eight days, and the only independent count on the record still says roughly 80 mines sit in the main channel.

Published 2026-08-26 · analysis

On Tuesday afternoon Washington declared the mine problem solved. Trump's post, timestamped 14:30 UTC, said the US Navy had informed him that all mines had been removed or detonated from the international waters of the Strait of Hormuz, with a zero-tolerance policy on any new ones. At 16:46 UTC — two hours and sixteen minutes later — IRNA carried a joint Iran–Oman statement announcing a temporary maritime corridor and a joint project to clear mines from the same strait. One government says the water is clean. The other, the same afternoon, agreed to go and clean it.

The all-clear was not new either. The same sentence — all water mines removed or detonated — was published on 18 August at 13:30 UTC, seven days and an hour earlier, in a post that also called the strait “open and operating.” On Wednesday morning Iran's deputy foreign minister said the understanding with Oman is not a reopening and that the waterway remains “militarily closed.” The two mine claims can just about be reconciled — the American one is scoped to international waters and the clearance project is not — but those two descriptions of the strait cannot. It has been open and operating and militarily closed for eight days running.

The last count on this record from anyone who is not a party to the war is 19 June, when the Joint Maritime Information Center confirmed a mine near the recommended transit route and Intertanko put roughly 80 still to be cleared from the main channel. Nothing has replaced that number in the two months since. Every claim about how many mines are in the Strait of Hormuz now comes from a government with a position on whether the strait is open.

Clearance has been announced as underway or finished for 168 days: the March ultimatum, the April order to shoot mine-layers while minesweepers worked “right now” at a “tripled up” level, the May and June deal terms, the July call with London, and now two all-clears in eight days. Across the 167 days from 10 March to 23 August, the last day with transit data, Hormuz carried 7.3 vessels a day; across the 2,588 days from January 2019 to the end of January 2026 it carried 83.4. Tankers are the sharper cut, at 1.9 a day this month against a pre-crisis 50.0. In the week after the first all-clear the seven-day average went from 4.0 vessels a day to 5.0. Whatever is keeping the other seventy-eight ships out, five and a half months of declared de-mining has bought three of them back.

We already know roughly what Tuesday is worth, because this arrangement has been priced once. When Iran and Oman agreed the corridor's coordinates on 5 August, Brent's next official close moved 0.2 percent — the 8th percentile of pre-crisis daily moves, with nothing else on the tape to confound it — and the transit count went from 5.7 vessels a day before to 5.6 after. So read Tuesday for what it is: the same corridor announced again by the same two capitals, beside an all-clear announced again by the third. The mines are either still in the water, in which case the all-clear is wrong, or they are gone, in which case they were never the binding constraint. Either way the announcement carries no information about when ships come back, and the transit count — which has answered every previous version of this the same way — is the only thing that will.

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