10 Million Barrels are Missing... I Found Them

Estimates of oil moving through the Strait of Hormuz differ substantially because AIS shutdowns, dark ship-to-ship transfers, crude-versus-products classifications, pipeline rerouting, vessel-loading assumptions, and different flow definitions complicate measurement. Prewar flows were about 23 million barrels per day, versus roughly 13–14 million in the U.S. government's low-end August estimate and about 12 million in commercial tracking data.

The divergence between government and commercial flow estimates also reflects methodology: the U.S. government uses a seven-day average, while commercial providers rely on published tanker windows. Shin says the IEA's later balance more closely supported the government's Gulf-export estimates, partly because it could compare destination-port arrivals with earlier estimates after accounting for timing lags and dark ships.

Commercial monitoring can identify activity that standard AIS misses, but it cannot consistently establish cargo, volume, or sanctions status. SAR can detect AIS-dark vessels through clouds and darkness, while paired tankers and hyperspectral imaging can help verify suspected offshore transfers; analysts still must reconstruct incomplete timelines through forensic back-calculation and inference.

The surveillance gap between commercial and military systems is substantial: military networks offer continuous observation, sub-10-centimeter optical resolution, high-frequency SAR, signals intelligence, and anti-jamming and anti-spoofing capabilities. Commercial systems remain vulnerable to predictable satellite schedules, weather, AIS blackouts, limited SAR availability, and dark ships operating near legitimate vessels.