
Shipping through the Strait of Hormuz has plummeted. One of the world's most important shipping bottlenecks connects the oil-rich Persian Gulf to the rest of the world. Here's how global shipping traffic has changed since the US and Israel launched strikes on Iran on February 28.
At least six ships have transited the Strait of Hormuz in recent days, most after turning off their maritime tracking signals or attempting to hide their true positions, according to MarineTraffic data reviewed by CNN.
Ships, including three bulk carriers, a crude oil tanker, and two oil/chemical tankers, have been passing through the Strait since March 6.
Hormuz is a key energy transit route that carries roughly a fifth of global crude oil shipments. It has been effectively closed since the start of the war, after the Iranian military warned that any ship passing through it would be attacked.
Among the ships identified by CNN and MarineTraffic is the Dalia, an Iranian-flagged oil and chemical tanker that has been sanctioned by the U.S. Treasury and the European Union. According to the data, the ship stopped transmitting its Automatic Identification System (AIS), a mandatory tracking system used by ships, on March 8 after approaching the Strait from east of Iran.

It reappeared on MarineTraffic on March 10 after transiting the Strait, before anchoring at the port of Bandar Imam Khomeini, Iran, a day later.
A similar tactic was used by the Shenlong, a Liberian-flagged crude oil tanker that arrived in Mumbai, India, on March 11, and the KSL Hengyang, a Singapore-bound cargo ship sailing under the Jordanian flag.
Others, such as the Palau-flagged tanker Parimal, appeared to have followed a normal route through the Strait until March 7, when it was hit by GPS jamming, MarineTraffic data shows.
Other ships near the Strait have begun broadcasting messages that appear to be aimed at discouraging Iran from attacking them. The messages, usually broadcast to a ship's destination port, include "CHINAOWNERALLLCHINESE" and "CHINA OWNER&CREW."
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