Off the Iranian port of Chabahar, which is outside the Persian Gulf but barely outside the US embargo line, tankers loaded with Iranian oil are gathering.
According to satellite photos and assessments from United Against Nuclear Iran and maritime intelligence agency Windward, six to eight supertankers were idling in waters close to the port in the Gulf of Oman late last week, with other smaller tankers in the vicinity. The US Navy claimed to have rerouted two enormous crude ships that it had intercepted last week in the same region.
The accumulation of tankers at Chabahar is further proof that Iran is still loading oil onto ships and that the US blockade is effectively preventing fuel from reaching consumers.

Vortexa Ltd. estimates that 155 million barrels of Iranian crude are either in transit or floating storage worldwide. By boarding tankers in the Indian Ocean and punishing a significant Chinese refiner that it claimed was a buyer of Iranian oil, the US has been putting more pressure on Tehran.
Iran seems to be bringing older vessels back into operation, however it's unclear how many more empty tankers are available for it to load crude aboard.
According to ship-tracking data, a 30-year-old VLCC with a capacity of up to two million barrels of crude started signalling last week from the Persian Gulf after last delivering a cargo three years ago.