About 9 million barrels of Iranian crude have been carried past the U.S. Navy's blockade line since restrictions began, according to an April 20 analysis by Vortexa. The movements include very large crude carriers and gas carriers detected transiting beyond the line drawn from Oman’s Ras al Hadd to the Iran-Pakistan border, and they have complicated deliveries and raised logistics risks for refiners and traders across the Asia-Pacific. Commercial trackers named vessels such as the Iran-flagged Hero II and Hedy, plus the gas carrier Tara Gas, among those that have sailed into the Arabian Sea in recent weeks, with individual cargoes and valuations reported by monitoring groups. President Donald Trump said he is reviewing a 14-point Iranian proposal that seeks lifting sanctions.

Satellite imagery and commercial vessel-tracking firms have recorded multiple large tankers and gas carriers moving past the formal blockade line the U.S. Navy drew from Ras al Hadd to the Iran-Pakistan border. Vortexa's April 20 analysis identified the Iran-flagged very large crude carriers Hero II and Hedy moving into the Arabian Sea on that date, and those two ships together can carry up to about 4 million barrels of crude, Vortexa reported.

Tracking the flows

Vortexa's tally is only one picture of a wider pattern. The firm said roughly 34 Iran-linked tankers and gas carriers have been observed moving through or around the blockade line, with 19 leaving the Persian Gulf and 17 of those believed to be carrying cargo. Altogether Vortexa estimated roughly 9 million barrels were ferried in total. Other monitoring groups and regional reporting flagged a broader flotilla, with dozens of vessels detected around the Strait of Hormuz and the Gulf of Oman since the blockade began.

Commercial trackers have also named individual ships and traced apparent cargo lifts. Monitoring platforms Kpler and Vortexa say the very large gas carrier Tara Gas, which earlier carried Iranian cargoes and which advocacy groups have linked back to Iran under a previous name, crossed the U.S. Line and sailed southeast into the Arabian Sea on a voyage that ship registries show lifted Iranian LPG in early May. Ship-track analysis also picked up smaller sanctioned vessels such as the G Summer and longer-range tankers like Atlantis II operating near Hormuz.

One very large crude carrier tracked as HUGE was identified by TankerTrackers.com as carrying about 1.9 million barrels of crude, a cargo the group valued at roughly $220 million. That valuation comes from a single tracker and hasn't been independently verified in open-source data.

Mastheads

Enforcement, countermeasures and market risk

U.S. Military and coalition operations have tried to enforce the line while keeping interdiction activity farther afield. U.S. Central Command has published imagery showing amphibious and surface ships operating in the Arabian Sea during enforcement sorties. U.S.

Statements and reporting describe seizures and boardings of at least one Iran-linked cargo ship and one sanctioned oil tanker in waters east of Sri Lanka since the blockade was declared.

There are notable discrepancies between military accounts and commercial trackers. U.S. Central Command publicly said it had redirected 65 commercial vessels and disabled four since the blockade began, while a CENTCOM social-media post cited elsewhere put the number of redirected vessels at 48. Those differing tallies underline the difficulty of reconciling military briefings, social-media posts and independent tracking firms' analyses.

Iranian forces have acted to control transit through the strait and nearby waters. The Islamic Revolutionary Guard Corps said it intercepted and directed multiple vessels toward the Iranian coast, and Iran released footage of seizures. In one case a Liberia-flagged container ship, Epaminondas, was reported by its management firm as having been approached and fired upon, with damage to the ship's bridge.

Iranian state-linked media and officials have framed continued exports and transit as a response to the U.S. Blockade. U.S. Officials, by contrast, say the blockade applies to Iranian ports and coastline and that interdiction efforts have reduced Tehran's revenue. The specific destinations and buyers for many of the cargoes detected remain unclear in open tracking data, so markets and commentators must treat individual vessel valuations and cargo volumes with caution.

The movements and clashes have rippled through shipping insurance, chartering and refining operations in the Asia-Pacific, where most Iranian exports ultimately land. Traders and refiners face additional route disruptions, the risk of seizures, and the possibility of exchange-of-fire incidents that complicate delivery schedules and add to logistics costs. Those added risks translate into higher insurance premiums and greater operational uncertainty for firms that rely on timely cargo lifts.

Commercial ship-tracking will continue to generate new movements and revised tallies as monitoring firms publish updated imagery and as military commands release further briefings. For analysts, the immediate challenge is reconciling competing counts and following cargo chains through an opaque network of ship re-flagging, ship-name changes, and transhipments.

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President Donald Trump said he is reviewing a 14-point proposal from Tehran that seeks lifting sanctions and an end to the US naval blockade, a decision that could determine whether the recent flows of Iranian crude and LPG through the Arabian Sea continue or are sharply curtailed.

This article was created with AI assistance.