The Strait of Hormuz, a narrow passage connecting the Persian Gulf to the Gulf of Oman, has long been the world’s most critical oil chokepoint. But for months, global shipping lines have been quietly rerouting, avoiding the strait like a plague ship. Sources in the maritime insurance industry confirm that premiums for vessels transiting the region have tripled since last year. The reason is threefold, and none of it is speculation.
First, the risk of seizure. Iranian Revolutionary Guard Corps (IRGC) naval units have been increasingly aggressive, boarding and detaining commercial vessels under flimsy pretexts. In April, the tanker 'Advantage Sweet' was impounded for allegedly colliding with an Iranian vessel. The crew remains in Iranian custody. Insurance underwriters now view the strait as a ‘hostile environment’, and many policies explicitly exclude coverage for seizure or detention. One Lloyd's underwriter told me, ‘We are effectively blacklisting the strait. If a ship goes in, they are on their own.’
Second, the threat of mines. Unconfirmed but persistent reports from naval intelligence indicate that Iran has been laying naval mines in the deeper channels. A mine strike can cripple a tanker in minutes, turning a multi-million dollar vessel into an environmental disaster. The US Navy’s Fifth Fleet has confirmed an increase in ‘counter-mine operations’ in the region. But they cannot guarantee safe passage. Shipping lines are not taking that risk. The cost of a mine strike, even without casualties, runs into the hundreds of millions in repairs, lost cargo, and liability.
Third, the lack of reliable naval escort. While the US and UK have naval assets in the region, they cannot escort every commercial vessel through the strait. The ‘International Maritime Security Construct’ (IMSC) operates on a ‘follow us’ basis, but convoys are infrequent and prioritise military supply ships. Shipping companies have told me that the escort promise is ‘a paper shield’. One logistics director in Dubai said, ‘The navies will protect their own. We are civilian targets.’
The result is a steady exodus. Major shipping lines like Maersk and MSC have quietly reduced their exposure, routing goods via the Suez Canal or around the Cape of Good Hope. That adds days and costs, but it is a known risk versus an unknown one. The Iranian rial has collapsed, but Tehran still holds the strait hostage. Every week that passes without a diplomatic solution pushes global trade further onto alternative routes. The question is not whether shipping will return to normal. The question is whether normal still exists.
