Written for humanitarian and policy readers: it connects security conditions to civilian effects, and implies no operational coordination.
When commercial transit failed, tens of thousands of seafarers were left aboard ships unable to sail. The International Maritime Organization recorded the numbers, the fatalities and the conditions, and coordinated an evacuation that took months.
How to read the grades
- ConfirmedDocumented as having occurred, with sources.
- Plausible exposureA mechanism Vigil assesses as likely; not documented as having occurred.
- Unconfirmed scenarioNamed because it is worth watching. Not asserted.
A step can never be graded more firmly than the step it depends on: a consequence cannot be better established than its cause. That rule is enforced when this site is built, not applied by hand — a chain that broke it would fail the build rather than publish.
- Trigger
Loss of safe commercial transit through the Strait of Hormuz from February 2026
- Affected area or systemConfirmed
The crews of commercial vessels inside the Gulf and in the strait's approaches, aboard ships whose ability to leave depended on transit conditions they did not control.
Documented as having occurred, with sources.
- Access or service disruptionConfirmed
Transit became unsafe and vessels stopped moving. On 24 April 2026 the IMO Secretary-General stated there was no safe transit anywhere in the strait, urged maximum caution over potential mines, and recorded 29 verified attacks on vessels and at least 10 seafarers killed.
Documented as having occurred, with sources.
- Civilian conditionConfirmed
Approximately 20,000 seafarers were stranded aboard around 1,600 vessels in late April, with dwindling water, food and fuel aboard and a mounting mental-health toll. An IMO-coordinated evacuation began in June covering more than 11,000; about 6,000 remained aboard roughly 500 ships by mid-July. By 11 August the IMO recorded 65 confirmed incidents and 17 confirmed seafarer fatalities.
Documented as having occurred, with sources.
- Broader humanitarian significanceConfirmed
A chokepoint constraint is a humanitarian condition as well as an economic one, and the people it falls on are not parties to the conflict. The evacuation required the belligerents to refrain from attacking maritime assets while it proceeded, which made crew safety a matter of negotiation between them.
Documented as having occurred, with sources.
Civilian conditions affected
Named as plain labels rather than a controlled vocabulary, so this list cannot drift from the commodity names the module's economy section already uses.
What remains unknown
- The IMO's April figure counts verified attacks on vessels in the Gulf and strait area; its August figure counts confirmed incidents across the strait and the wider Middle East. The geographic scope differs and the two are not a single series.
Seafarers still aboard
The IMO figure for crews stranded, which has fallen from roughly 20,000 as evacuation proceeded.
Confirmed incidents and fatalities
The IMO tally, which is the only deduplicated count available.
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Assessed as of2026-09Last reviewed2026-09-04