One Week Into the Ceasefire: A Maritime Intelligence Breakdown

At a Glance

• One week after the ceasefire announcement, the Strait of Hormuz has not reopened to normal commercial traffic.
• Transit continues, but under controlled, selective, and inconsistent conditions shaped first by Iranian routing control and then by U.S. enforcement.
• The risk profile has not normalized, as blue-chip operators and major oil majors remain absent, while sanctioned, falsely flagged, and risk-tolerant vessels continue to dominate activity.
• Gulf trade flows have structurally adapted through diversion networks centered on Salalah, Sohar, Khor Fakkan, Fujairah, and Jebel Ali.
• Iranian exports remain active, supported by dark activity, spoofing, and sustained loading at Kharg Island.
• U.S. mine clearance and blockade measures have added a second layer of control, pushing the Strait from a controlled chokepoint into a contested maritime space.
• One week into the ceasefire, the system is functioning, but still under constraint, uncertainty, and overlapping enforcement regimes.

The First Week of the Ceasefire at Sea

One week after the ceasefire was announced, the maritime system has not returned to open navigation. Instead, the ceasefire has introduced a more complex operating environment, with continued vessel movement but no consistent framework for access or navigation.

In the immediate aftermath of the announcement, transit through the Strait of Hormuz continued, but only under the same IRGC-controlled structure that had been in place since mid-March. Routing remained confined to alternative corridors through or alongside Iranian territorial waters, approval was still required, and vessels were explicitly warned that unauthorized transit could be targeted. 

As the week progressed, it became clear that this was not a reopening, but a supervised pause. Transit conditions remained undefined, toll proposals and inspection requirements began to emerge, and no agreed legal or diplomatic framework was finalized. At the same time, insurance constraints, unresolved enforcement conditions, and the continued absence of mainstream operators confirmed that the market did not view the ceasefire as a return to commercial normalcy.

By the second half of the week, the operating picture shifted again. U.S. mine clearance operations began inside the Strait, followed by a blockade targeting traffic linked to Iranian ports. The result was a new two-layer environment: Iranian control still shaping routing and access, and U.S. enforcement beginning to shape vessel behavior on top of it.

The first week of the ceasefire, therefore, did not produce normalization. It produced a more complex maritime regime, where access remained controlled, movement continued selectively, and trade flows stayed constrained even as enforcement expanded.

Hormuz Remains Open Only in a Controlled Sense

The central trend of the week is that Hormuz remains active, but not open.

On April 7, the day before the ceasefire announcement, 11 vessels transited the Strait, four inbound and seven outbound, all via the Northern Corridor through Iranian-controlled waters. 

On April 8, the two-week ceasefire began, and five bulk carriers were tracked outbound, all confined to the IRGC-controlled corridor. 

By April 9, only limited additional movements were observed, including one handysize bulk carrier inbound, a small product tanker outbound, and a sanctioned, falsely flagged LPG carrier carrying Iranian cargo outbound, after previously aborting its transit attempt. Additional vessel presence consists primarily of Iran-flagged ships operating within the controlled corridor.

This pattern held through the early part of the week. Transit remained possible, but only under selective access, alternative routing, and continued threat signaling, with vessels operating under Iranian-controlled corridors and approval requirements.

That shifted as U.S. enforcement was introduced. Following the announcement and subsequent implementation of the blockade, vessel behavior became more fragmented, with turnarounds, delays, dark activity, and selective continuation replacing the earlier, more structured transit pattern.

Volumes rose later in the week, but not in a way that indicated normalization. On April 11, 17 vessels transited the Strait, followed by 21 on April 12, the day the blockade was announced.

On April 13, 17 vessels transited the Strait of Hormuz, including 10 inbound and 7 outbound. However, behavior reflected continued uncertainty rather than stable access. One LPG tanker executed a U-turn within the Strait, reinforcing the lack of predictable passage conditions.

That uncertainty became more pronounced on April 14. A total of 19 vessels transited, but the balance shifted sharply toward outbound movement, with 14 outbound and only 5 inbound. At the vessel level, behavior remained inconsistent. 

Ships turned around before and after transit, slowed to unusually low speeds, drifted in holding patterns, or continued under constrained routing along Iranian-controlled corridors. Some vessels resumed movement after hesitation, while others avoided completing transit altogether.

These patterns show that transit increased in volume, but not in consistency. More vessels moved through the Strait, but not under open, predictable, or broadly commercial conditions.

The Risk Profile Did Not Improve

One week into the ceasefire, the most important commercial signal is not how many ships transited, but which ones did.

Throughout the week, the cohort remained dominated by sanctioned, falsely flagged, Iran-linked, or otherwise risk-tolerant vessels. No blue-chip operators returned. No major oil majors resumed visible participation. Mainstream commercial confidence did not follow the ceasefire announcement.

This was evident from the outset. Early ceasefire transits were limited and highly selective, with only a narrow set of operators moving under controlled conditions rather than a broader return of commercial traffic. That dynamic held as volumes increased on April 11 and April 12, where activity expanded but participation remained constrained.

It became even clearer once the U.S. blockade took effect on April 13. Sanctioned and falsely flagged vessels continued to transit, while others turned around, slowed, drifted, or went dark.

Several vessel cases during the week illustrate this gap between nominal ceasefire conditions and real operating risk. 

CHRISTIANNA (IMO: 9596703), a Liberia-flagged bulk carrier, transited outbound on April 13, went dark for approximately 15 hours after clearing the Strait, then reappeared and executed a U-turn, ultimately moving away from the area. 

ELPIS (IMO 9212400), a falsely flagged and U.S.-sanctioned tanker, also went dark after transit, with behavior consistent with a potential blockade breach followed by evasive maneuvering or interdiction.

RICH STARRY (IMO: 9773301), a sanctioned tanker carrying Iranian cargo, abandoned an outbound transit shortly before the blockade came into effect, resumed movement hours later, and then turned around again after nearly clearing the Strait, indicating active decision-making to avoid enforcement exposure. In parallel, other vessels abandoned inbound transits, drifted in the Gulf of Oman, or continued movement while hugging Iranian territorial waters, reflecting attempts to reduce exposure while maintaining limited access.

These are not the behaviors of a market that sees access as restored. They are the behaviors of a market still operating under ambiguity, permission, and enforcement risk.

Gulf Trade Has Adapted Instead of Waiting

While transit through Hormuz remained constrained, regional trade flows continued to adapt through alternative networks.

By this point, the diversion architecture built during the conflict is no longer a temporary workaround. It is a functioning logistics system. Direct calls into in-Gulf ports such as Jebel Ali, Dammam, and Hamad have been replaced by a five-node structure centered on Salalah, Sohar, Khor Fakkan, Fujairah, and Jebel Ali.

Salalah has become the primary Gulf land-bridge hub. It recorded 26 port-of-destination changes during the week, below the March peak but still far above pre-war norms, and 91 transshipment-changed cases, indicating large-scale rewiring of onward cargo connections. 

Sohar has stabilized as the secondary land-bridge hub. Its 48 destination-change cases, roughly three times the pre-war baseline, suggest that diverted cargo has settled into a higher steady state. The absence of major delay or rollover spikes indicates that Sohar is handling its elevated role within capacity.

Khor Fakkan has become the UAE’s principal east coast intake point. With 85 destination changes in a single week, it is clearly functioning as a preferred discharge point for UAE-bound cargo that would previously have called Jebel Ali directly. But the April 5 projectile incident introduced a new variable. What had been a mainly operational and commercial calculation may now also include security exposure.

Fujairah is functioning as an overflow point under strain. The terminal recorded 6 rollovers and 10 delay cases during the week, while 86 destination changes show that carriers are increasingly terminating voyages there despite the resulting friction. This reflects a shortage of viable alternatives, compounded by Fujairah’s already weakened bunkering role, following earlier drone strikes and force majeure conditions. The port is now operating under dual strain as both an impaired energy hub and an emergency container gateway, functioning as a safety valve rather than a stable long-term solution.

Jebel Ali remains central, but no longer as an ocean-side gateway. With 18 destination-change events during the week, it is increasingly serving as the inland redistribution endpoint for cargo arriving via upstream diversion nodes.

This architecture is unlikely to unwind quickly, even if the ceasefire holds. War-risk insurance, backlog pressure, congestion risk, and unresolved transit governance mean that the current system has already moved from improvisation into operational normalization.

The Cost of Trade Has Been Rewritten

One thing that has become increasingly clear throughout the conflict is that avoiding Hormuz comes with a measurable operational cost.

A single Europe–Gulf container rotation illustrates this clearly. A 14,000 TEU vessel operating on a London–UAE service would normally transit via Suez and Hormuz, bunker in Fujairah, and complete the voyage in approximately 25 days. Under current conditions, the same service is forced around the Cape of Good Hope, with bunkering shifted to Colombo and final discharge pushed outside the Strait to ports such as Khor Fakkan.

The result is an increase from 25 to 41 transit days, one additional port call purely for fuel, and cargo discharge away from the intended destination. The additional 6,500 nautical miles and roughly 15 sailing days add an estimated $300–400 per TEU in operating cost, with emergency bunker surcharges and war-risk premiums pushing total freight rates on Europe–Gulf lanes to roughly 25% above pre-crisis levels.

These costs remain embedded in current routing decisions.

Iranian Exports Remain Structurally Active

The ceasefire week also confirmed that Iranian export operations remain active and structurally resilient under constrained transit conditions.

As of April 8, Iranian activity continued across both crude and refined product segments. Kharg Island remained active, and later in the week, satellite imagery from April 11 identified three VLCCs loading there, with an estimated combined volume of approximately 6 million barrels of crude oil. 

Since March 1, total departures from Kharg Island have reached approximately 58.75 million barrels, with more than 90% directed toward China.

By April 13, total Iranian oil-on-water stood at approximately 157.7 million barrels, with 97.6% destined for China. Remote Sensing Intelligence also identified two non-AIS transmitting VLCCs loading at Kharg Island, with an estimated combined capacity of approximately 4 million barrels, reinforcing the continued role of dark activity in supporting export continuity.

A SAR image from April 12 at 17:42 UTC shows three VLCCs loading at Kharg Island. By April 13 at 05:40 UTC, only two VLCCs remained, indicating that one vessel likely departed during this window, just hours before the blockade took effect.

The departed vessel is assessed to be laden with Iranian crude and likely bound for China.

One of the remaining vessels, a VLCC+, is currently in ballast and reporting Iraq as its destination while spoofing its position approximately 44.5 nautical miles west of Kharg Island.

This activity confirms that Iranian exports remain structurally intact, supported by dark fleet operations and increasingly reliant on deceptive shipping practices and reduced-visibility practices, despite increasing external pressure. 

The U.S. blockade directly targets these flows, which have averaged approximately 2 million barrels per day in recent months, making it a vital financial lifeline for the Islamic Republic. How these flows respond to enforcement will be a key indicator of the blockade’s real impact.

The U.S. Added a Second Layer of Control

The most important structural change during the ceasefire week came from the U.S. side.

What began as Iranian-controlled access turned into a dual-control environment once U.S. mine clearance operations began and were followed by a blockade targeting traffic entering and exiting Iranian ports. This changed the Strait from a controlled chokepoint into a contested maritime space.

On April 11, U.S. guided-missile destroyers entered the Arabian Gulf to begin mine clearance operations. Leadership then signaled potential interdiction and broader enforcement actions. 

By April 13, the blockade had formally taken effect. It applied regardless of vessel nationality if the traffic was linked to Iranian ports, while still allowing passage through the Strait for other vessels.

This did not immediately halt movement. Instead, it introduced a second layer of risk and uncertainty. Vessels were no longer responding only to Iranian access constraints. They were also reacting to potential interdiction under U.S. enforcement.

The first effects were visible quickly. Sanctioned vessels turned around shortly before and around the enforcement deadline. Others resumed transit after hesitation, went dark after passage, or attempted to use Iranian coastal routing to reduce exposure. The operating environment shifted from controlled access to overlapping control systems, where enforcement, evasion, and selective continuation all occurred simultaneously.

Global Flows Contained to Rebalance

The ceasefire week also showed that global crude flows are continuing to rebalance away from the Gulf.

A total of 172 crude tankers were en route to the U.S. Gulf Coast as of April 11. This reflected a sharp increase in inbound volumes, with Windward detecting a 46% increase in arrivals via the northern corridor from Europe and a 132% increase via the southern corridor from Asia and the Gulf.

At the same time, regional producers were already preparing for a possible reopening. Saudi Arabia, Kuwait, and Iraq requested loading nominations for April and May cargoes requiring transit through Hormuz. But those preparations ran ahead of conditions at sea. Actual transit volumes did not show a matching restoration of confidence.

The market is planning for recovery. The shipping system is not yet operating as if recovery has arrived.

Outlook

One week into the ceasefire, the key trends are clear.

Hormuz remains under controlled access, not open navigation. Transit has continued, and at times increased, but under selective, risk-tolerant, and inconsistent conditions. The market has not returned. Blue-chip operators remain absent, insurance constraints remain binding, and vessel participation remains narrow.

At the same time, the ceasefire has not reversed the structural adjustments built during the conflict. Gulf trade flows remain reorganized through Oman and the UAE’s east coast. Alternative routing continues to extend voyage time and cost. Iranian exports remain active through dark and reduced-visibility operations. U.S. mine clearance and blockade measures have added a second enforcement layer rather than replacing the first.

The result is a more complex operating environment. Movement exists, but without a consistent framework for access, routing, or enforcement. Operators are making decisions in real time, under overlapping constraints and competing signals.

If the ceasefire is extended and transit increases without incident, operators may begin reassessing risk. But even under a best-case scenario, the path back will be measured in weeks for cargo release and months for trade normalization.

For now, full normalization remains out of reach. The Strait of Hormuz is functioning, but only within a narrow, controlled, and uncertain operating framework.