Hormuz reopening still constrained

What's happened

U.S. and Iranian officials have reached a preliminary memorandum to reopen the Strait of Hormuz and halt their war, but shipping remains limited. Owners and insurers are waiting for mine clearance, safe-route details and formal assurances; experts say demining and insurance normalization will take weeks to months and full pre-war volumes will not return quickly.

What's behind the headline?

Where the agreement helps

• The memorandum has reduced immediate market panic: Brent futures fell about 5% after reports of the deal, reflecting expectations that some flows will restart.
• Some tankers have been moving under naval escort and hugging Oman's coast, so limited trade corridors are already operating and will expand once routes are certified.

Why shipping will not surge overnight

• Mines remain the dominant obstacle. Multiple sources estimate conventional minesweeping and drone operations will run for 40–50 days before many companies will feel confident. One mine can destroy a supertanker and kill crew; insurers will not restore normal cover until clearance is verifiable.
• Owners need concrete operational details: who will clear and certify routes, whether vessels must report to regional authorities, and what guarantees the U.S. and Iran will give. Industry groups such as BIMCO are continuing to call for explicit safe-route information.

The timetable and economic knock-on

• Demining plus staged insurance normalization will take weeks to months. Even optimistic operational estimates that clear local chokepoints still leave a backlog: an estimated 155–215 tankers are waiting in the region.
• Returning to pre-conflict volumes will likely stretch into 2027 unless the agreement holds, production is restored and insurers rapidly lower premiums.

Political leverage and risks

• Iran retains leverage because it has signalled it will control navigation services and may charge fees once the interim window expires. Any ambiguity in who administers safety will slow commercial decisions.
• The deal will only stick if both Washington and Tehran provide unambiguous, on-the-record commitments and allow independent verification of mine clearance.

What happens next

• Navies and private minesweeping units will begin or accelerate clearance operations; shipowners will demand certified mine-free corridors and updated insurance terms. Traffic will increase gradually, but meaningful recovery of global oil flows will take months and depends on sustained calm.

How we got here

The U.S.-Iran war began on February 28 and has choked the strait that once carried about 20% of global oil and LNG. Tehran has threatened mines and briefly allowed limited escorted transits; recent talks have produced a tentative deal to reopen the waterway and lift the U.S. blockade, with a short toll-free period reportedly agreed.

Our analysis

Reuters and Reuters (Jonathan Saul) report that U.S. and Iranian officials are expected to sign a memorandum of understanding to end their war and reopen the strait on Friday, and that initial industry reaction has been muted because mines and insurance remain unresolved. Reuters quoted shipping groups including BIMCO and major shippers such as Nippon Yusen saying they will only resume navigation once safety has been fully confirmed. The Times of Israel and Reuters (Saul) cite Western maritime security sources estimating that minesweeping operations could run 40–50 days before insurers and owners regain confidence; The Times of Israel quoted BIMCO's Jakob Larsen saying, "We still consider it very risky for ships to commence transits at this point." The Japan Times and Bloomberg note that some buyers have been inundating Persian Gulf energy officials with questions about whether oil can now move through the waterway; The Japan Times reported a reported 60-day toll-free transit period agreed between parties. The New Arab and Independent Business emphasise the humanitarian and commercial strain: the International Maritime Organisation said 20,000 seafarers are stuck and the International Transport Workers' Federation warned that backlog, crew changes and rest needs mean a realistic return to normal patterns is weeks if not months away. The New York Times flagged Iran's stated intention to "charge a 'service fee'" for passage in the future, a point U.S. officials oppose. Across the coverage, direct quotations drive the caution: Jakob Larsen told Reuters and The New Arab that the security situation "remains volatile," while V.Group's Rene Kofod-Olsen warned, "One sea mine is enough to have fatalities." These sources converge on the same operational barriers—mines, certification and insurance—while differing slightly on optimism about timelines and the political terms Iran will insist on once the strait reopens.

Go deeper

• How will demining be coordinated and which navies or contractors will lead the work?
• What specific insurance terms will owners demand before restarting regular transits?
• Will Iran charge passage fees after the reported 60-day toll-free window ends?

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