Full Breakdown
Sharp Decline in Strait of Hormuz Vessel Transits Amid Rising Regional Tensions
By Drooid · · How we work
Core Event: Vessel Crossings Plummet to Single Digits
Preliminary ship-tracking data released in mid-September show that only four vessels transited the Strait of Hormuz on September 16, down from seven the previous day. The same data indicate two ships exited the Gulf and two entered, with none being very large crude carriers or LNG tankers. Reuters noted four transits on September 15, while SANA cited four exits and ten entries on an earlier day. The 10-day moving average of daily crossings stands at 18, far above the current single-digit levels.
Background & Context: From Heavy Pre-War Traffic to Current Disruption
Before the war that began on February 28, the strait handled roughly 125 commercial vessels per day, about 20 % of the world’s daily crude oil and LNG supply. Since then, attacks—including recent Houthi strikes on Saudi infrastructure and a reported mine-related explosion of an oil tanker in the strait—have prompted shippers to avoid the waterway. Gulf states have also postponed scheduled talks with Iran that were intended to negotiate navigation arrangements.
Data & Statistics
- Daily transits: 4 vessels on September 16; 4 vessels on September 15.
- 10-day average: 18 vessels per day (Reuters, Oilprice).
- Pre-war baseline: ~125 vessels per day (Voice of Emirates, Emirates247).
- Bab el-Mandeb traffic: 22 vessels on September 16 and 21 vessels on September 15.
- Cargo types: One very large gas carrier (Salute) with ~470,000 bbl LPG; one Panamax tanker (Nautilus) with ~510,000 bbl naphtha; two dry bulk carriers; two oil tankers in ballast.
- Untracked vessels: Sources note vessels may switch off AIS transponders, so reported numbers likely understate actual traffic.
Official Statements & Responses
- Iran’s Islamic Revolutionary Guard Corps, as reported by Fars, announced that an oil tanker exploded after colliding with mines in the strait, though timing was not disclosed.
- Iranian authorities released a list of 77 vessels accused of violating transit protocols, warning of possible fines, detention, or confiscation, and urging marine insurers and classification societies to cease services to those ships.
- Gulf states postponed the planned talks with Iran on navigation through the strait, citing the heightened security environment.
Conflicting Reports & Gaps
The reported figures differ across outlets. Reuters and Oilprice both cite four transits on September 15, while SANA mentions ten vessels entering on an earlier day. All sources acknowledge that AIS-off vessels are not captured, creating uncertainty about the true volume of traffic. No source provides a comprehensive count that includes dark-mode ships.
Why It Matters: Implications for Global Energy Trade
The sustained reduction in transits threatens the reliability of a chokepoint that supplies roughly one-fifth of global oil and LNG. The International Monetary Fund has warned that prolonged disruptions could raise freight and insurance costs, depress global oil inventories, and pressure alternative routes such as the Bab el-Mandeb Strait or the Cape of Good Hope. Even with pipelines in Saudi Arabia and the United Arab Emirates offering partial relief, attacks on those infrastructures suggest that rerouting does not eliminate risk, merely shifts it.
On-the-Ground Reports
Local observations in Singapore confirm that the decline is evident in real-time tracking dashboards, with Kpler data showing a drop from ten vessels on September 15 to four on September 16. The same data highlight a parallel decline in Bab el-Mandeb traffic, underscoring a broader regional slowdown.
The convergence of intensified attacks, regulatory warnings, and the exclusion of AIS-off vessels paints a picture of a waterway that, while technically open, is functionally marginal for global trade.