The Strait of Hormuz is more open than previously thought as the U.S. shoots down Iranian drones threatening ships and provides ‘naval overwatch’

"The attack drones posed an immediate threat to regional maritime traffic," U.S. Central Command said.

Talks to extend the ceasefire between the U.S. and Iran are dead in the water, but traffic through the Strait of Hormuz is anything but.

The number of ships transiting the contested waterway remains just a fraction of pre-war levels, but fresh reports indicate activity is busier than previously thought.

In the last two months—roughly the time that the ceasefire has been in place—U.S. forces have counted nearly 1,000 commercial vessels going in and out of the strait, sources told Bloomberg, adding that most were large cargo and container ships.

That translates to about 17 ships per day. While that is well below the daily rate of more than 100 ships before the U.S. and Israel launched their war on Iran on Feb. 28, that’s significantly more than other reports show.

For example, U.S. Navy data published by the Joint Maritime Information Center tallied 558 cargo ships and oil tankers crossing the strait during the three-month period from March 1 to June 3. And maritime data company Kpler counted 895 ships between March 1 and May 19.

The 1,000-ship figure presumably includes vessels that turned off their Automatic Identification Systems, which broadcast their positions, as well as ships that are using both the Iran-sanctioned route and the alternate route along Oman’s coast.

The Islamic Revolutionary Guard Corps established its lane soon after the war started. Since then, the IRGC has charged tolls on ships that have been granted permission and attacked any that tried to cross unauthorized.

To bypass the IRGC-controlled lane, the U.S. Navy began mine-clearing operations in April and sent two destroyers through the strait to re-establish freedom of navigation near Oman’s coast. That was followed by Project Freedom last month, which aimed to get more ships out with U.S. help, but it ended after only a few days.

The U.S. military still managed to carve out the Omani lane and has been quietly aiding ships get through the strait while they travel “dark.” Over a recent three-week span, U.S. Central Command guided about 70 ships in and out of the Persian Gulf, sources told the New York Times late last month.  

Central Command has insisted that it’s not escorting ships. Instead, it’s offering advice to commercial vessels in the region.

The U.S. military keeps an eye on traffic with radar, drones and other tools to help ships transit safely, while also advising them on when to turn off AIS and how to respond to Iranian threats, according to the Wall Street Journal.

The alternate lane has become even more important as global oil markets are poised to head off a cliff in a matter of weeks, when crude reserves are expected to reach critically low levels.

U.S. Navy

But Iran’s ability to stop Hormuz traffic has emerged as its key source of leverage over the U.S., and the regime will not relinquish it, turning the Persian Gulf into more of a combat zone recently despite the ceasefire.

Last month, the IRGC launched attacks into the Gulf and attempted to lay new underwater mines. The U.S. responded by destroying Iranian boats and bombing missile sites in Iran that tried to shoot down U.S. aircraft.

Last weekend, the U.S. disabled a ship attempting to breach its naval blockade by firing a missile into the engine room. Also last weekend, the U.S. conducted “self-defense strikes” in Goruk, Iran, and Qeshm Island.

After Iran shot down a U.S. drone, fighter aircraft destroyed Iranian air defenses, a ground control station, and two attack drones that threatened ships in transit, Central Command said.

Then on Friday, Central Command said U.S. forces shot down Iranian missiles and drones launched toward the Strait of Hormuz and Gulf neighbors, while hinting again at its protective role over commercial ships.

“The attack drones posed an immediate threat to regional maritime traffic,” it said in a statement. “U.S. forces subsequently struck Iranian coastal surveillance radar sites in Goruk and on Qeshm Island to defend against further maritime attacks.”

Lloyd’s List reported on Wednesday that nearly 40 non-Iranian linked vessels have exited the Gulf in the past three weeks, bringing total departures of once-stranded ships since March to 142.

It attributed the steady wave of Hormuz transits to “quiet U.S. naval overwatch” and a growing willingness among ship operators to finally exit despite the risks.  

Shipowners recently told Bloomberg that Iranian fast boats approached a group of vessels transiting through the strait, but turned away after helicopters suddenly appeared.

The report didn’t identify the helicopters, and Central Command declined to comment when asked if they were from the U.S. military.

The continued flow of Hormuz traffic through U.S. and Iranian routes in the face of persistent attacks could help establish a new normal where the world adapts to the reality of the vital chokepoint remaining at risk.

“While it’s hard to imagine a world in which the Strait never reopens, it’s also hard to imagine the world economy ever again depending on the region for 20% of its oil and gas needs,” Christopher Smart, a former trade adviser and Treasury official in the Obama administration, wrote in a New York Times op-ed on Thursday.

“Desperate buyers always manage to find new sellers when the old ones can’t deliver. The longer the world lives without the Gulf’s supplies, the easier it gets,” he added.

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This story was originally featured on Fortune.com