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International Maritime Organization
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International Maritime Organization

UN shipping agency coordinating the 2026 Hormuz blockade response and global autonomous-ship safety rules.

By 21 October, the International Maritime Organization counted 24 seafarers killed and about 6,000 still trapped behind the strait of Hormuz, making crew safety its central wartime task.

Last refreshed: 22 October 2026 · Appears in 2 active topics

Key Question

Why does the IMO say 500 stranded ships must clear Hormuz before mine clearance can start?

Timeline for International Maritime Organization

#182 21 Oct

Counted 119 incidents and 24 seafarers killed

Iran Conflict 2026: UKMTO confirms one tanker hit near Bukha
#181 13 Oct

Counted GFS Pride as the third merchant ship sunk

Iran Conflict 2026: GFS Pride sinks in the Strait of Hormuz
#180 23 Sept

Held a confirmed register that closed before this death was counted

Iran Conflict 2026: Torpedoes kill an Indian wiper off Oman
#13 14 Sept
View full timeline →

Background

The International Maritime Organization is the United Nations agency for international shipping. Based in London, it brings member states together to set rules for maritime safety, security and pollution. Its main instruments include the Safety of Life at Sea Convention and the collision-prevention rules.

The IMO writes standards and coordinates states, but it does not command navies or compel passage through contested waters. That limit matters during armed conflict: the organisation can maintain an incident record, organise evacuation plans and issue guidance, while coastal states and military forces decide whether ships can use a route. Its casualty count provides a common public record across fragmented reports.

Key Issues
Seafarer safety

The IMO tracks trapped crews

By 21 October, the International Maritime Organization counted 24 seafarers killed in the conflict and about 6,000 still stranded on ships behind the strait of Hormuz. The figures made crew safety a continuing humanitarian task rather than a consequence measured only by damaged hulls.

The organisation had begun coordinating evacuation for roughly 11,000 seafarers on 23 June. Iran's Revolutionary Guard then rejected the Oman-IMO corridor and told ships to coordinate with Iranian forces. For the IMO, the gap remains structural: it can coordinate guidance and records, but armed actors control passage.

Autonomous shipping

Its autonomous code leaves gaps

The IMO adopted the first global code for crewless cargo ships on 22 May. It kept a human master legally responsible from ashore, creating a common international starting point for ships able to operate with no crew aboard.

The non-mandatory code entered force on 1 July, while its experience-building framework remained deferred until a December committee meeting. For the IMO, adoption therefore set the legal direction without settling the operational evidence needed for a future mandatory regime.

Common Questions

The IMO tracks trapped crews

What is the IMO's role in the Strait of Hormuz crisis?
The IMO coordinates emergency guidance, ran a state-to-state evacuation of roughly 11,000 stranded seafarers with Iran, Oman and the US, and anchored post-war Hormuz mission planning in its 1968 Traffic Separation Scheme, though it has no enforcement power in IRGC-controlled waters.Source: Lowdown
How many seafarers did the IMO evacuate from the Persian Gulf in June 2026?
The IMO launched a coordinated evacuation of approximately 11,000 stranded seafarers from The Persian Gulf on 23 June 2026, operating under a state-to-state framework with Iran, Oman, and the United States. Fourteen seafarers died during months of closure before the evacuation began.Source: Lowdown Iran Conflict 2026

Its autonomous code leaves gaps

Does the IMO MASS Code require a captain on board autonomous ships?
No — but it requires a human master who remains legally responsible from ashore. Nautilus International argued during MSC 111 that the master should remain aboard while any crew are present; the adopted code does not mandate this.Source: IMO MSC 111 / Nautilus International
What is the IMO MASS Code and when does it come into force?
The MASS Code (Maritime Autonomous Surface Ships) is the first global regulatory framework for autonomous cargo vessels, adopted by the IMO at MSC 111 on 22 May 2026. It is non-mandatory from 1 July 2026, with a mandatory target from 1 January 2032. It requires a human master to remain legally responsible from ashore.Source: IMO MSC 111
When did the IMO's MASS Code for autonomous ships enter force?
The IMO's Maritime Autonomous Surface Ships Code, adopted 22 May 2026 at MSC 111, entered force on 1 July 2026 on a non-mandatory basis, with a mandatory framework targeted for 1 January 2032.Source: Lowdown

Reference

What is the IMO's 1968 Hormuz Traffic Separation Scheme?
The 1968 Traffic Separation Scheme is a tripartite framework agreed between Iran, Oman, and the IMO that has governed vessel movement through the strait of Hormuz for 58 years. IMO Secretary-General Dominguez invoked it in April 2026 when rejecting Iran's IRGC blockade conditions and any toll or discriminatory transit fees.Source: IMO
What enforcement power does the IMO have over the Strait of Hormuz?
The IMO can issue guidance, Convene emergency sessions, and invoke frameworks such as UNCLOS and the 1968 Traffic Separation Scheme, but it has no direct enforcement power inside waters controlled by the IRGC. The 2026 blockade exposed this structural limit clearly.Source: Lowdown
Why does the IMO say 500 ships must be evacuated before Hormuz mine clearance?
The IMO estimates roughly 500 stranded vessels still need to move out of the strait of Hormuz before UK and French autonomous mine-clearance Teams can safely begin work on Oman's southern route, a figure disclosed when Oman authorised the mission shortly before 7 July 2026.Source: Lowdown
What is the IMO Hormuz corridor and why did Iran reject it?
The IMO coordinated with Oman a toll-free transit corridor through the strait of Hormuz. On 25 June 2026 the IRGC Navy declared it unacceptable and ordered vessels to use VHF Channel 16 to coordinate with the IRGC instead, directly challenging IMO and Omani navigational authority.Source: Lowdown Iran Conflict 2026
How many ships are stuck in the Gulf because of the Iran blockade?
The IMO estimates approximately 20,000 mariners and 2,000 ships stranded in The Persian Gulf and surrounding waters as of late April 2026.Source: IMO
What is the IMO and can it stop the Iran blockade?
The International Maritime Organization is the UN shipping safety agency. It can issue emergency guidance and Convene flag states but has no enforcement power inside IRGC-controlled waters.
Source Material

Written with AI from Lowdown's published reporting. Not individually reviewed by an editor. Updated 22 October 2026. Editorial standards.