Iran Dark Fleet Slips Past U.S. Blockade

Source: wsj.com

TL;DR

The story at a glance

Iran-linked ships in the so-called dark fleet have evaded a U.S. naval blockade of Iranian ports in the Strait of Hormuz, according to Lloyd’s List Intelligence and brokers. U.S. Central Command reports turning back 23 vessels, while at least 26 laden ones passed through, including oil tankers. The article highlights this gap one week after the blockade began on April 13 amid an ongoing Iran war involving Israel and the U.S. One example is the Greek-owned cargo ship Basel, which left Bandar Imam Khomeini on April 15 and crossed the line on April 19.[[1]](https://www.wsj.com/livecoverage/iran-war-israel-us-strait-hormuz-2026/card/iran-dark-fleet-vessels-slip-through-blockade-FOA0FJA3PNxMk8IrHwAV)

Key points

Details and context

The dark fleet consists of Iran-linked vessels often used to carry oil and gas while evading sanctions. These ships have sailed despite the U.S. blockade line in the Strait of Hormuz, a key route for global energy shipments. Tracking comes from maritime intelligence firm Lloyd’s List Intelligence and brokers who arrange the cargoes.[[1]](https://www.wsj.com/livecoverage/iran-war-israel-us-strait-hormuz-2026/card/iran-dark-fleet-vessels-slip-through-blockade-FOA0FJA3PNxMk8IrHwAV)

The Basel, a general cargo carrier, provides a specific case: brokers in Athens shared its path with the Wall Street Journal, showing it left an Iranian port days after the blockade started and crossed undetected until confirmed later. U.S. claims of a full halt contrast with this data, suggesting enforcement gaps for some traffic.[[1]](https://www.wsj.com/livecoverage/iran-war-israel-us-strait-hormuz-2026/card/iran-dark-fleet-vessels-slip-through-blockade-FOA0FJA3PNxMk8IrHwAV)

Key quotes

Adm. Brad Cooper, head of U.S. Central Command: "American forces had completely halted sea trade in and out of Iran."[[1]](https://www.wsj.com/livecoverage/iran-war-israel-us-strait-hormuz-2026/card/iran-dark-fleet-vessels-slip-through-blockade-FOA0FJA3PNxMk8IrHwAV)

Why it matters

The incomplete blockade allows Iran to continue some oil and gas exports, sustaining revenue amid war pressures from the U.S. and Israel. Shippers, brokers, and markets face higher risks of interception or evasion tactics, affecting global energy flows through the strait. Watch U.S. Central Command updates on interceptions and any escalation in boarding or seizures of dark fleet vessels.[[1]](https://www.wsj.com/livecoverage/iran-war-israel-us-strait-hormuz-2026/card/iran-dark-fleet-vessels-slip-through-blockade-FOA0FJA3PNxMk8IrHwAV)

What changed

Before April 13, Iran-linked dark fleet ships moved oil and gas cargoes through the Strait of Hormuz without U.S. blockade interference. Now, U.S. forces enforce a naval line, turning back 23 vessels while 26 laden ones have passed according to trackers. The shift began April 13, revealing limits in the claimed full halt on Iranian sea trade.[[1]](https://www.wsj.com/livecoverage/iran-war-israel-us-strait-hormuz-2026/card/iran-dark-fleet-vessels-slip-through-blockade-FOA0FJA3PNxMk8IrHwAV)

FAQ

Q: How many Iran-linked ships evaded the U.S. blockade?

A: At least 26 laden ships have sailed in and out of Iranian ports since April 13, per Lloyd’s List Intelligence. This includes 11 oil-and-gas tankers and two large crude carriers. U.S. Central Command reports turning back 23 others.[[1]](https://www.wsj.com/livecoverage/iran-war-israel-us-strait-hormuz-2026/card/iran-dark-fleet-vessels-slip-through-blockade-FOA0FJA3PNxMk8IrHwAV)

Q: What is an example of a ship that passed the blockade?

A: The Greek-owned general cargo carrier Basel left Bandar Imam Khomeini on April 15 and passed the blockade line on April 19. Brokers in Athens confirmed this to the Wall Street Journal, with Lloyd’s List Intelligence verifying the crossing.[[1]](https://www.wsj.com/livecoverage/iran-war-israel-us-strait-hormuz-2026/card/iran-dark-fleet-vessels-slip-through-blockade-FOA0FJA3PNxMk8IrHwAV)

Q: What did U.S. Central Command claim about the blockade?

A: Adm. Brad Cooper said American forces had completely halted sea trade in and out of Iran. Yet data shows 26 ships passed despite 23 being turned back.[[1]](https://www.wsj.com/livecoverage/iran-war-israel-us-strait-hormuz-2026/card/iran-dark-fleet-vessels-slip-through-blockade-FOA0FJA3PNxMk8IrHwAV)

Q: What types of vessels slipped through?

A: Eleven were oil-and-gas tankers, and two were large crude carriers each able to move around two million barrels of oil. These Iran-linked ships carried cargoes despite the blockade.[[1]](https://www.wsj.com/livecoverage/iran-war-israel-us-strait-hormuz-2026/card/iran-dark-fleet-vessels-slip-through-blockade-FOA0FJA3PNxMk8IrHwAV)