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Iran’s Revolutionary Guards announced designated alternative shipping routes through the Strait of Hormuz on Wednesday, warning that sea mines may be present in the waterway’s main transit area as vessels resume passage under a two week ceasefire with the United States.
The directive affects one of the world’s most critical maritime chokepoints. Roughly one fifth of global oil supply transits the strait, and any restriction on safe passage ripples through tanker markets, energy pricing, and downstream cargo flows within hours.
Designated routes replace main channel
Iranian authorities said vessels must follow specific entry and exit corridors to avoid the risk of striking sea mines. The instructions, reported by local media and attributed to the Revolutionary Guards, apply to all commercial shipping transiting the strait during the ceasefire period.
Iran had effectively blocked the waterway since early March, triggering a sustained rise in global energy prices and forcing tanker operators to suspend or reroute sailings. The closure also disrupted breakbulk and project cargo movements serving Gulf state ports that depend on strait access.
The two week ceasefire was reached shortly before a deadline set by US President Donald Trump for Iran to accept terms linked to reopening the route.
Operators face lingering risk
Although transit has resumed, the explicit reference to sea mines signals that the strait remains a contested operational environment. Vessel operators, insurers, and charterers now face the task of assessing whether the designated corridors are sufficiently surveyed and cleared.
War risk insurance premiums for Gulf transits, which climbed sharply after the March closure, are expected to remain elevated while mine warnings stay in effect. Tanker and dry cargo owners will likely factor additional risk pricing into spot and short term charter rates.
Ceasefire window narrows outlook
The temporary nature of the agreement leaves the market exposed to a renewed closure once the two week window expires. Shippers and refiners that rely on Gulf crude and petrochemical feedstocks are weighing contingency routing through alternative corridors, including the Cape of Good Hope.
Port operators across the Arabian Gulf reported early signs of cargo backlogs clearing, but terminal sources cautioned that full normalization depends on whether the ceasefire holds and mine clearance operations proceed.
The situation remains fluid. Industry participants said they are monitoring diplomatic developments closely, with the next critical date falling at the end of the ceasefire period.
