Fifteen Tanker Transfers in One Day Reveal the Secret Workaround Keeping Gulf Oil Moving
TankerTrackers says satellite imagery captured 15 ship-to-ship transfers in the Gulf of Oman in one day as smaller shuttle vessels carried non-Iranian Gulf oil through Hormuz. The workaround reduces exposure—but creates new safety, sanctions and escalation risks.
Fifteen ship-to-ship oil transfers were observed in the Gulf of Oman in a single day, according to satellite-monitoring service TankerTrackers. The cargo reportedly came from every major Gulf producing state except Iran.
The number offers a rare view of the improvised logistics system keeping part of the world’s energy supply moving while normal traffic through the Strait of Hormuz remains severely restricted.
The method is simple in concept and complicated in execution. Smaller, faster shuttle tankers enter or exit the Gulf through the available channel. Once outside the chokepoint, they pull alongside larger ocean-going vessels in designated or improvised transfer areas. Hoses move the crude or fuel between ships, allowing the large tanker to continue toward Asia or other markets without entering the most dangerous waters.
Reuters has independently confirmed the broader shuttle strategy used by Gulf producers including Saudi Arabia and the United Arab Emirates. TankerTrackers’ precise count of 15 transfers and its cargo-origin assessment come from proprietary satellite analysis and should be attributed accordingly. Automatic-identification signals can be incomplete, delayed or switched off, so a single-day snapshot is not a full balance sheet.
Why use small ships? They can make faster turns, require less exposure time and distribute risk. Losing access to one shuttle removes less capacity than losing a very large crude carrier. They may also navigate alternative lanes more flexibly and coordinate with naval protection.
The large tanker remains useful because long-distance transport rewards scale. A relay system tries to combine the agility of small vessels at the dangerous crossing with the economics of a larger hull on the open sea.
This is not free capacity. Each transfer needs two compatible ships, calm enough conditions, trained crews, hoses, fenders, monitoring and time. Cargo handling creates spill and fire risks. Scheduling becomes fragile: if a shuttle is delayed, a large tanker waits; if the receiving vessel is late, the shuttle may become floating storage.
Insurance and liability grow complex. Which owner is responsible if a hose fails? Does war-risk coverage apply during the crossing, the transfer or both? Is the cargo origin documented clearly enough for customs and sanctions checks? A chain designed for resilience can also create more paperwork and more opportunities for concealment.
Iran has noticed. Tehran announced a blacklist of 45 vessels it says violated transit protocols and threatened fines, detention or confiscation. Reuters reported that some blacklisted ships are linked to Saudi Aramco and ADNOC operations. At least several refiners and one global energy company were reconsidering their use of listed vessels because of the risk.
That response shows the shuttle system’s strategic weakness. The transfer happens outside Hormuz, but the smaller vessel still must cross the strait. Iran can monitor names, ownership patterns and repeated routes. Operators can substitute ships, but each replacement requires commercial arrangements and may itself be listed.
The United States reportedly backs the effort as a way to preserve Gulf exports while applying economic pressure to Iran. Washington’s Navy says it has cleared the central traffic lane of suspected mines, potentially allowing greater two-way movement. Iran and Oman are discussing a separate temporary corridor. These initiatives could complement each other—or compete over who controls passage.
For Gulf producers, ship-to-ship transfers are a bridge rather than a replacement for normal shipping. Saudi Arabia and the UAE have pipelines that bypass parts of Hormuz, but capacity and destinations are limited. Qatar’s liquefied natural gas is especially difficult to reroute. Iraq, Kuwait and Bahrain remain deeply exposed.
The transfers can also affect market interpretation. Visible activity may reassure traders that barrels are still moving, reducing price spikes. But the extra cost, lower throughput and possibility of interdiction mean the same satellite images can be read as evidence of resilience or stress.
Iranian oil’s reported absence from the observed transfers is politically important. If accurate, the workaround benefits Tehran’s neighbors while Washington attempts to sever Iran’s own export channels. Iranian officials may see that as economic warfare passing through waters they can influence. Gulf states see it as protection of lawful commerce. Both narratives increase the risk that a commercial operation becomes a military target.
The system’s success cannot be judged by the number of dramatic satellite pairings alone. The relevant measures are barrels delivered, transfer accidents, voyage costs, insurer participation and whether Iran acts on its blacklist. A busy day may reflect growing efficiency—or a backlog being cleared.
Can the shuttle chain become a stable new normal? It can buy time and reduce concentration of risk. It cannot reproduce the simplicity, speed and legal certainty of an open strait. The more elaborate the workaround becomes, the more it reveals the value of the route it is trying to replace.
### What to watch next
Watch daily cargo volumes rather than ship counts, AIS gaps, spill reports, insurance premiums, enforcement of Iran’s 45-vessel blacklist and changes after the U.S. lane clearance or Iran-Oman corridor talks. Independent satellite confirmation would strengthen the reported 15-transfer figure.