Global Oil Market Under Stress: Iran’s Dark Fleet Keeps Flows Steady
It almost looks like an eternal story or an Australian boomerang approach, but the global oil market is once again being misread, very badly. Headlines speak of disruption, paralysis, and the near closure of the Strait of Hormuz. International tanker trackers all report traffic collapsing, while Gulf exporters are shutting in production. Every single visible metric indicates that the system is under extreme stress. And yet, there is still oil flowing. This time it is not open, not as usual able to be measured by markets, or in volumes that are immediately transparent. Still, flows are there, moving steadily and deliberately, in quantities large enough to reshape the current balance of the global market.
The real mechanism is a paradox, built on Iran’s so-called “dark fleet”. It is still working as a shadow logistics system that evolved from a sanctions workaround and has become a strategic instrument of geopolitical power. The real uncomfortable truth of it all is that, for now, it is not only tolerated by the international system but also indirectly relied upon.
Shadow Logistics System: Iran’s Dark Fleet in Focus
While the conventional flows in the Strait of Hormuz are effectively closed, the reality is that it has not been “totally” closed. The flows have been transformed. Instead of a global artery open to all, Hormuz has become a selectively controlled corridor. Yes, overall commercial traffic has collapsed, with a decline of more than 90 percent compared to normal levels. It should, however, be recognized that this collapse is uneven. It applies primarily to Western-linked shipping, major Gulf exporters, and vessels operating within regulated insurance and compliance frameworks.
At present, there is a well-functioning parallel system in place that continues to operate beneath this visible collapse. Iranian-linked tankers, sanctioned vessels, and ships operating under opaque ownership structures are still clearly moving through the strait, often with tacit or explicit tolerance from Iranian naval forces. The ultimate result is a bifurcated maritime system: one visible, regulated, and largely immobilized; the other opaque, flexible, and still active.
Iran’s Dark Fleet: A Strategic Instrument of Geopolitical Power
For markets and pundits, this distinction should matter enormously. Because Saudi Arabia, the UAE, and other Gulf producers are seeing exports constrained or rerouted at great cost, Iran has managed to sustain flows at strikingly resilient levels. Current estimates indicate that Iranian exports have remained in the range of 1.5 to 1.7 million bpd, which is surprisingly at pre-war levels. In March alone, more than 16 million barrels are estimated to have transited through Hormuz under these conditions.
Again, markets need to realize that the chokepoint is not closed, but Iranian-controlled. The current situation is not accidental at all, as Tehran has been setting it up over years of adapting to sanctions pressure, drawing on lessons learned from Russia’s post-Ukraine shadow-fleet operations. Even though it is hard to admit, Tehran has managed to set up a system that is sophisticated, decentralized, and remarkably difficult to disrupt without escalating into a full-scale maritime conflict.
The Dark Fleet’s Operations: AIS Signals and Ship-to-Ship Transfers
At its core, the dark fleet relies on ownership opacity, the manipulation or outright deactivation of AIS signals, and the extensive use of ship-to-ship transfers. At the same time, these tankers are transparent and shell companies, often in jurisdictions with limited transparency, and flagged in states with weak enforcement. As has been seen again in the last few weeks, all of these vessels routinely “go dark” during critical phases of their voyages. At the start of the conflict, it was reported that at least 40 vessels were observed disabling AIS signals, a number that has likely increased as operations intensified.
None of these vessels operate under the same level of transparency and regulation as those in the conventional system. The result is a parallel logistics network that can be difficult to track and monitor.
Original Article: How Iran’s Dark Fleet Is Quietly Keeping Oil Markets Afloat — Oilprice