Karachi: The Pakistani oil tanker Karachi (Aframax oil tanker) passed through on March 15-16 with its Automatic Identification System operating openly, taking a route close to Iranian waters, indicating the existence of monitored or safer corridors in the Strait of Hormuz.According to the report of US TV channel 'CNN', three Pakistani oil tankers have crossed the Strait of Hormuz in the past 10 days, according to shipping sources and ship-tracking data, suggesting Iran may be granting safe passage for select shipments.Meanwhile a tanker laden with crude oil appears to have cleared the Strait of Hormuz and is now sailing to Pakistan, according to ship-tracking data, making it the latest in just a trickle of vessels that have left the Persian Gulf since US and Israeli strikes on Iran began.The Karachi, controlled by Pakistan's National Shipping Corp., made the perilous journey over the course of Sunday, according to data compiled by Bloomberg. By Monday morning, the Pakistan-flagged Aframax was seen in t he waters off Oman's Sohar.