Just under 100 ships have passed through the Strait of Hormuz since the start of March, according to data analysed by BBC Verify, despite periodic attacks on shipping in the area by Iranian forces.
While some energy and everyday goods are still moving through one of the world's busiest shipping lanes, daily traffic is down about 95% since the Iran war began on 28 February.
Before the war, about 138 ships passed through the strait each day according to the Joint Maritime Information Centre, carrying one fifth of the global oil supply.
The data provided by shipping analysts Kpler shows 99 vessels passing the narrow strait so far this month, an average of just 5-6 vessels a day.
Our analysis indicates that about a third of these recent crossings were made by ships with connections to Iran.
These include 14 vessels sailing under Iran's flag and others under sanctions due to suspected links to Tehran's oil trade.
Nine other ships were owned by companies with addresses linked to China, while six listed India as their destination.
Some ships successfully crossing the strait appear to be taking a longer route than usual. Tracking data for a Pakistan-flagged oil tanker suggests it sailed close to the Iranian coast on its passage through the strait on 15 March.
Bradley Martin, senior researcher at the US defence think tank RAND Corporation, suggested that the ship might be responding to some set of directions from Iran.
In an attempt to evade detection, many ships appear to be deliberately switching off their tracking system - known as AIS (Automatic Identification System).
Although this helps ships conceal their position, it also presents challenges for firms tracking movements in the strait.
Amid the ongoing risk of attacks, vessels are taking steps to navigate safely through the strait, highlighting tensions in this vital region of global maritime trade.
