Hormuz Conflict Risks 11 Million Barrels of Oil and Gulf Marine Ecosystems

Key points

• US forces struck five Iranian oil tankers on September 8, three days after hitting three others, following Iranian missile attacks on US naval vessels.
• MarineTraffic data indicates 42 tankers are currently waiting to transit the Strait of Hormuz, with 18 carrying oil, totaling an estimated 1.76 million cubic meters of petroleum products.
• Since the start of the conflict, at least 75 ships have been attacked, causing 21 seafarer deaths, six fires, and two minor oil spills.
• The Caroline Bezengi tanker has been leaking oil since running aground in June, with Reuters estimating it carried 800,000 barrels, potentially affecting 40km of Omani coastline.
• Researchers warn that oil pollution in the Gulf has increased fourfold compared to the previous year, threatening coral reefs, mangroves, and fisheries that support local economies.

Background

This escalation follows a protracted US-Iran war that began in early 2026, characterized by repeated strikes on military and commercial targets. Previous coverage noted that Gulf states were fortifying defenses and seeking alternative trade routes to bypass Hormuz, while oil prices surged and global energy import bills increased by $330 billion in six months. The current maritime conflict represents a new phase where commercial shipping and environmental stability are directly threatened by tit-for-tat attacks on tankers and naval vessels.

Why it matters

The Strait of Hormuz is a critical chokepoint for global energy supplies, and any major oil spill could have long-term ecological and economic consequences. The Gulf’s marine ecosystems are already stressed by chronic pollution and limited water exchange, making them vulnerable to further damage. Additionally, oil contamination could disrupt desalination plants that provide fresh water to nearly 65 million people in the region, exacerbating humanitarian and economic pressures. The conflict’s impact on marine life and coastal infrastructure underscores the broader risks of maritime warfare in environmentally sensitive areas.

What to watch

Analysts expect continued tension in the Strait of Hormuz as both sides maintain their tit-for-tat attacks on shipping. Environmental monitoring will be critical to assess the extent of oil spills and their impact on marine ecosystems. Gulf states may accelerate efforts to diversify energy routes and strengthen environmental safeguards, while international attention may focus on potential diplomatic resolutions to prevent further escalation. The long-term recovery of the Gulf’s marine environment will depend on the scale of pollution and the effectiveness of cleanup efforts.