War on Iran: What is Tehran's 'shadow fleet' really and how does it work?

The US has reimposed a naval blockade on Iran after a failed peace deal, forcing Iran to use a 'shadow fleet' of aging tankers to sell oil to China and others. These tankers evade detection by disabling tracking signals and using 'flags of convenience' from countries like Bermuda and Panama. The fleet operates in a legal grey zone, enabling Iran to bypass US sanctions despite secondary penalties on the Iranian energy sector.