On the afternoon of July 25, the Greek-owned supertanker Kiku docked at Qatar’s Mesaieed oil export terminal, a massive, 30-berth port on the country’s west coast, 25 miles south of Doha.

Four days later, loaded with crude oil, the Kiku passed through the Strait of Hormuz. The Very Large Crude Carrier – the largest oil tanker class, stretching over 1,000 feet – maintained a steady pace of 13 knots across the Persian Gulf, near its top speed.

Then, on July 31, shortly after 2 pm just off the coast of Dubai, the Kiku vanished.

The vessel had switched off its AIS transponder, a marine radio device that broadcasts a ship’s identity, speed, course and position. To tracking services that monitor worldwide maritime traffic, it was as if the Kiku simply disappeared.

Suddenly, at 10 am on August 1, the Kiku’s signal reappeared – on the other side of the Strait of Hormuz.