BLUF
CRIMSON HORIZON (IMO 9456321), a VLCC owned by the OFAC-designated National Iranian Tanker Company (NITC) , conducted what appears to be a ship-to-ship transfer with OCEAN SENTINEL (IMO 9612378) for 47 minutes on 2026-05-04 between 07:32–08:19 UTC at approximately 25.21°N 55.32°E . Both vessels operated at <0.5 knots within 180m of each other in 38m water , a configuration consistent with active cargo transfer rather than incidental encounter.
OCEAN SENTINEL changed flag from Iran (IRN) to the Marshall Islands (MHL) on 2026-04-12, 22 days prior to this encounter . This timing is consistent with the well-documented "flag-hop then transfer" pattern used to obscure beneficial ownership in sanctions-evasion operations.
What we know
- CRIMSON HORIZON has been continuously broadcasting AIS for 90 days; no spoofing detected.
- The 47-minute encounter was preceded by a 6.2-hour AIS gap on CRIMSON HORIZON beginning 2026-05-04 01:08 UTC [ev:cl-pg-003] — sufficient to receive cargo at a coastal location not yet identified.
- OCEAN SENTINEL's beneficial-owner chain resolves to a Singapore-registered shell with directors overlapping NITC subsidiaries (3-hop ownership trace, Sayari).
What we do not know
- The cargo type and quantity transferred.
- Whether OCEAN SENTINEL is heading to a sanctioned destination (current AIS destination: UNDECLARED).
- Whether prior STS events between these two vessels exist in the past 90 days (full historical pull pending).
Recommended next analyst action
File OFAC SAR within 7 days; flag OCEAN SENTINEL for proactive monitoring and coordinate with FinCEN for downstream wire-transfer correlation.