On Sunday, the Singapore-flagged products tanker Navig8 Messi was burning off Oman, in footage verified by Reuters. Two days later, Brent crude briefly fell below $90 a barrel for the first time since August 31, touching $89.65, after President Donald Trump said he would hold off on fresh strikes against Iran for now, a decision he said was taken “at the behest of countries that are their neighbours”.
Markets are pricing in de-escalation. The sea is telling a different story. Reuters reported, citing data from the Washington Institute for Near East Policy, a US think tank, that 37 ships were attacked in October, the highest monthly total since the war began. Iranian state broadcaster IRIB, citing the Revolutionary Guard (IRGC) navy, said the Navig8 Messi was among three tankers hit on Sunday for using routes Tehran deemed unauthorised; that account has not been independently confirmed. On Tuesday, the day Brent dipped, the IRGC navy said on its Telegram channel that “a third tanker” on an unauthorised route had struck a sea mine and caught fire in the eastern strait. It did not name the vessel, flag or crew.
The price fall was not only about Iran. Tim Waterer, chief market analyst at KCM Trade, said investors were prioritising Trump’s more conciliatory tone since the midterms, but fears that a US interest-rate rise could curb demand, and oversupply concerns as Gulf producers cut prices to win back buyers, also weighed on crude, Reuters and Gulf News reported. By Wednesday in Asia, Brent was back near $92, still about 23% below its October 30 peak near $118.
The war’s cost shows up less in the benchmark than in what it now takes to move a barrel. OPEC estimates put very large crude carrier freight from the Middle East to East Asia at $37.13 a barrel at the end of October, up from $3.18 at the end of January. Insurance on the same route rose from 6 cents to $12.29 a barrel. By OPEC’s estimate, freight and insurance now make up about 30% of the total cost of crude, against roughly 3% normally. These are estimates for one route, not prices for every Gulf cargo, but they show where the burden has moved.
Insurance has become more expensive and harder to arrange, though cover has not disappeared. David Osler, law and marine insurance editor at Lloyd’s List, told gCaptain in September that war-risk claims had reached about $2 billion since the fighting began, and that higher premium income would offset them. Howden Re’s April assessment described cancellations in some categories of cover alongside the reinstatement of hull and cargo war-risk capacity. “All cover is voyage-by-voyage as there are no annual war risk policies being written for Gulf,” it noted.
The damage is visible from orbit. Wim Zwijnenburg, an environmental investigator at the Dutch peace organisation PAX, identified a roughly 160-kilometre spill in November 8 satellite imagery and linked it to the damaged tanker Vieira off Fujairah. Khor Fakkan municipality temporarily closed Al Luluia beach after oil patches appeared, and Reuters verified footage of oil reaching Omani shores.
The human toll is counted too. The International Maritime Organization had confirmed 133 incidents involving commercial vessels in the region by November 10, according to Reuters, and IMO figures record 25 seafarers killed since the war began.
Iran’s approach looks less like closure than selective coercion. By designating permitted routes and threatening ships that use others, Tehran can exert pressure without stopping every vessel. The IRGC navy says ships have hit mines because they used “dangerous and illegal passages”, and because the destruction of US radar and coastal navigation systems in the southern strait has raised the risk. In an August 1 statement reported by IntelliNews, Iran’s Foreign Ministry described its Hormuz measures as lawful self-defence against a US blockade it says meets the UN General Assembly’s definition of aggression.
Washington runs its own coercive campaign. CENTCOM said a US aircraft fired on and disabled the St Kitts and Nevis-flagged cargo vessel Huda in the Gulf of Oman on November 7 after it visited an Iranian port, saying its crew had ignored repeated warnings and tried several times to breach the blockade. CENTCOM estimates the blockade has kept more than $25 billion of Iranian crude from export in recent months. When the blockade was planned in April, a spokesman for Iran’s Khatam al-Anbia headquarters called it an “illegal measure and an instance of maritime piracy”, Tasnim reported.
None of these Iranian or American accounts has been independently verified. The result is clear enough: two sets of rules now apply to the same water. Ships on routes Iran has not approved risk being hit; ships that call at Iranian ports risk US fire. Each incident under one set of rules invites a response under the other.
The sequence has a precedent. On April 14, 1988, during the Tanker War phase of the Iran–Iraq war, the US frigate Samuel B. Roberts struck an Iranian mine in the Gulf, injuring ten sailors. Four days later, the US Navy launched Operation Praying Mantis against Iranian targets, according to the US Naval History and Heritage Command.
The stakes reach well beyond oil. UN Trade and Development estimates that Hormuz carries around a quarter of global seaborne oil trade and about a third of seaborne fertiliser trade. In March, the Asian Development Bank estimated that disruption lasting more than a year could cut growth in developing Asia and the Pacific by up to 1.3 percentage points over 2026–27 and add 3.2 points to inflation. That was a scenario, not a forecast, and it was published seven months before October’s attack count, the highest of the war.
The shipping lanes are not a side issue in the diplomacy; they are one of the main things being traded. Qatar is mediating between Washington and Tehran, but reports of progress rest largely on unnamed sources. On November 3, Anadolu, citing Al-Araby Al-Jadeed’s unnamed sources, reported that Washington had approved a draft memorandum; Al Arabiya reported the same from a senior source. Neither government has confirmed it on the record.
Iranian officials have been more open about the trade they want. On November 2, Foreign Ministry spokesman Esmaeil Baghaei said Iran’s seven-step proposal, “now condensed, making it possible to implement it within two days”, remained “the basis of dialogue” via mediators. As Reuters described it, the plan has the US lift its blockade of Iranian ports and Iran reopen Hormuz, with other issues to follow; Baghaei said nuclear talks would resume only after Iran verified its conditions had been met. Foreign Minister Abbas Araghchi put it more simply in an October interview with Al Jazeera: “On day one, the US implements a set of measures. On day two, the Strait of Hormuz will reopen, and navigation will be restored to what it used to be.”
Washington has rejected that sequence. Trump turned down Iran’s plan in September, and on November 8 Secretary of State Marco Rubio told reporters in Florida that Iran’s demands were “not just unacceptable, but in some cases, outrageous and ridiculous and really not realistic”. By November 9, Reuters reported, senior US and Gulf officials doubted an imminent breakthrough. A serious incident at sea could undermine the talks; a workable agreement could equally remove the incentive for further attacks.