With U.S. sanctions on Iran’s oil exports just six weeks away, at least ten Iranian oil supertankers have gone dark, not having broadcast any signal for at least a week, tanker tracking data compiled by Bloomberg shows, suggesting that Tehran may have resurrected the old unconventional tactic to conceal its crude oil shipments by switching off transponders on board. If Iran is deploying this tactic, tanker tracking data of Iranian oil exports may become less and less reliable as the starting date for the U.S. sanctions on Tehran’s oil approaches. Satellites and shore stations haven’t received any signals from the ten very large crude carriers (VLCC), each capable of transporting up to 2 million barrels of oil, for at least seven days, according to Bloomberg data. According to the tanker-tracking data, seven of those vessels, when last seen, were carrying a total of 13 million barrels of crude oil […]