When President Donald Trump announced the US deal with Iran on Sunday and declared the "opening" of the Strait of Hormuz, his Truth Social post ended with the words "Ships of the World, start your engines. Let the oil flow!" BBC Verify analysis of MarineTraffic ship-tracking data, however, shows that just seven vessels appear to have passed through the critical waterway since the deal was announced and as many as 580 ships appear to be waiting in the Gulf. Tehran effectively closed the Strait of Hormuz, through which about a fifth of the world's oil and gas supplies are usually transported, following US and Israeli strikes on 28 February.