The Environmental Time Bomb: Iranian “Dark Fleet” and Substandard Tankers in Southeast Asian Waters

(New York, NY)—As the International Oil Pollution Compensation Funds (IOPC) convenes in London this week to address the global framework for oil spill compensation, United Against Nuclear Iran (UANI) is sounding an urgent alarm. The continued use of aging, substandard, and under-insured vessels to transport sanctioned Iranian crude through the world’s most sensitive maritime chokepoints represents a catastrophic environmental risk that must be the top priority of the international maritime community.

UANI CEO Ambassador Mark D. Wallace released the following statement:

“As the IOPC convenes this week, the catastrophic risk of the dark fleet must be the top priority at this meeting. Consistent with IMO Resolution A.1192(33), UANI urges the IOPC Funds and regional authorities to increase surveillance, using satellite monitoring to track all tankers transiting the Lombok and Malacca Straits. 

“UANI also calls on the IOPC Funds to enforce port state control to seize or deny entry to any vessel lacking verifiable P&I insurance from the International Group. And finally, UANI recommends the IOPC Funds end flag hopping and hold registries accountable for flagging vessels that bypass MARPOL and SOLAS safety conventions.

“The transit of the Iranian crude oil tankers HUGE and DERYA is an act of environmental brinkmanship. The international community cannot wait for the next PABLO to occur in the heart of a marine protected area before taking decisive action.”

BACKGROUND

The Growing Threat in Southeast Asia

Southeast Asia has become the primary theater for the Iranian dark fleet, which UANI has highlighted in its Ghost Armada list. The scale of these high-risk operations is unprecedented:

• The EOPL Hotspot: From the start of the current Iran War on February 28 to today, UANI has recorded 124 tankers laden with Iranian oil at the Eastern Outer Port Limits (EOPL) off Malaysia.
• Unchecked Impunity: On May 5 alone, 26 ghost tankers were loitering near the EOPL with active AIS signals. Satellite imagery from May 4 confirmed at least three Ship-to-Ship (STS) transfers of Iranian oil occurring simultaneously.
• New Transit Patterns: In a dangerous shift to avoid interdiction, Iranian tankers are now transiting the Lombok Strait in Indonesia:
  • HUGE (IMO 9357183): Transited the strait on May 3 carrying ~ 2 million barrels.
  • DERYA (IMO 9569700): Transited on May 4 after a failed delivery attempt in India.

The Lombok Strait is a critical migratory path for marine life, flanked by Bali and Lombok—economies entirely dependent on tourism and fishing. These tankers take uneconomical, circuitous routes through the Indian Ocean, significantly increasing the duration of exposure for these sensitive environments.

Substandard Vessels and Regulatory Evasion

The Iranian fleet operates outside the bounds of international safety standards, directly flouting IMO Resolution A.1192(33), adopted in December 2023. This resolution specifically urges member states to prevent the dark fleet from engaging in deceptive practices that undermine maritime safety, such as:

• AIS Manipulation: Systematic disabling or "spoofing" of transponders to mask illicit cargo origins.
• Lack of Oversight: These vessels are often over 20 years old, lack reputable Classification Society oversight, and operate without valid P&I insurance from International Group clubs.

A History of Inaction: The PABLO Precedent

Three years ago, in May 2023, the tanker PABLO exploded in the Malaysian EOPL. A known dark fleet vessel, its explosion resulted in a destroyed hull and a massive fire. Because the vessel lacked legitimate insurance, salvage and cleanup costs were left in legal limbo. Despite this warning, the volume of substandard Iranian oil transit has only increased.

Impact on Coastal Communities

An oil spill in the Lombok or Malacca Straits would be economically and ecologically terminal for the region:

• Financial Vulnerability: Notably, Indonesia is not a Party to the 1992 IOPC Fund Convention. Should a spill occur in Indonesian waters, the government cannot tap into global funds for cleanup support.
• The IOPC Burden: In member states like Malaysia, the lack of valid insurance on dark fleet vessels means the financial burden may fall entirely on the IOPC Funds—effectively forcing the compliant shipping community to pay for the negligence of a sanctioned regime.