Zombie Tankers in Hormuz: Vessels Operating Under Identities of Ships Sent for Scrap Five Years Ago

At least two vessels have transited the Strait of Hormuz in recent days while broadcasting MMSI (Maritime Mobile Service Identity) signals identifying them as tankers that were sent for scrap five years and six months ago respectively. The M/T Nabiin signaled passage from the Persian Gulf to the Gulf of Oman on March 23, despite being dismantled at a Bangladesh scrapyard in 2021. The M/T Jamal exited the strait at the end of the previous week, broadcasting identifiers of an LNG carrier sent to India scrapping in October 2025. These are not data errors or historical database artifacts—they are real-time signal emissions from vessels actively transiting a contested waterway during a conflict.

The tactical pattern reveals an adaptation layer responding to the Strait's 95% traffic collapse and Iranian selective access controls. A vessel attempting to transit Hormuz faces three detection risks: visual identification (IRGC boarding teams), electronic identification (AIS transponder), and behavioral analysis (pattern deviation from baseline shipping routes). Spoofing the identity of a scrapped vessel sidesteps electronic identification risk—the transit authority's first-pass filter. No port authority, insurer, or boarding team expects a legitimate tanker to broadcast a scrapped vessel's identity. The psychological dissonance buys operational time.

The technical prerequisite requires AIS transceiver access and either knowledge of the scrapped vessel's original MMSI or access to stolen MMSI numbers. Windward Maritime Intelligence reported that signal interference in the region is creating AIS blackout zones—48-60 hour gaps where vessels vanish from tracking entirely. In these darkness periods, vessel operators can change transponder identities undetected. When they reappear, they are broadcasting a different vessel identity than when they disappeared. The scrapped-vessel angle is an added layer: even if suspicious analysts query the vessel's identity in port authorities' databases, they find a legitimate vessel—just one that sank or was scrapped years prior.

The broader implication is that traditional maritime identification systems (AIS, MMSI, flag registry) are now operationally compromised in conflict zones. Insurance underwriters, port authorities, and compliance databases rely on these identifiers as ground truth. Zombie tankers expose the vulnerability: any entity with MMSI spoofing capability can masquerade as legitimate traffic. The Hormuz case is an isolated conflict-zone phenomenon—for now. But the technology and methodology are commoditizing. If dark-fleet operators and sanctions evaders begin adopting zombie-tanker tactics at scale in other routes (Baltic, North Sea, Mediterranean), the maritime tracking infrastructure that underpins global compliance systems faces structural degradation.

For compliance teams: rely on AIS as a secondary verification layer only. Confirm vessel identity through independent MMSI checks against Lloyd's Register and IHS Markit, not just AIS transponder data. Request recent satellite imagery of vessel positions during dark-signal periods. Shadow fleet operators are now using scrapped-vessel masquerade tactics to evade detection. Legacy identification methods are insufficient.

The economic driver is asymmetric: the cost to spoof an MMSI (low hundreds to thousands of dollars) is insignificant relative to the value of a single tanker voyage avoiding the Straits chokepoint toll or sanctions enforcement risk. As long as the Hormuz closure persists and toll corridors extract USD 2 million per passage, operators will continue innovating evasion tactics. Zombie tankers are the current manifestation. Signal intelligence and AIS analytics are defensive responses. The fundamental problem is unchanged: geography creates chokepoints, conflict creates access control, and technology creates evasion mechanisms faster than enforcement can close gaps.