WSJ: US helping ships navigate Strait of Hormuz in 'dark mode'

Several ships and oil tankers have been covertly transiting the Strait of Hormuz with US assistance, disabling their identification systems to avoid detection by Iran. The tactic allows vessels to pass through the strategic waterway without Iran's knowledge.

Several vessels, including oil tankers, have in recent weeks been quietly transiting the Strait of Hormuz with US assistance by switching off their identification systems, the Wall Street Journal reports. The so-called 'dark sailing' method allows ships to pass through one of the world's most strategically vital waterways without Iran being aware of their movements.

The Strait of Hormuz, which connects the Persian Gulf to the Gulf of Oman, is one of the most critical chokepoints in global energy trade — roughly 20% of the world's oil supply passes through it. Iran has repeatedly threatened to close the strait during periods of heightened tension with the West.

By disabling automatic identification system (AIS) transponders, vessels effectively become invisible to those monitoring maritime traffic in the region. US cooperation in coordinating such transits suggests a broader effort to maintain freedom of navigation through the strategically sensitive waterway amid ongoing tensions with Tehran.

The development comes at a time of significant diplomatic activity between Washington and Tehran over Iran's nuclear programme. Ensuring unimpeded passage through the Strait of Hormuz remains a core interest for both the United States and its allies, who depend on stable oil flows from the Gulf region.