The Largest Oil Spill in History Was Not an Accident

Ask someone to name the worst oil spill in history and you will get Deepwater Horizon, or maybe the Exxon Valdez. Both are reasonable answers. Both are wrong by a wide margin.

The largest release of oil into the sea on record began on 19 January 1991, in the Persian Gulf, and NOAA’s estimate is 6 to 8 million barrels. Deepwater Horizon, the disaster that ran on American television for three straight months, was around four million.

The 1991 spill has no anniversary coverage, no documentary, and no date that anyone remembers. Part of the reason is that it does not fit the shape of a spill story. Nothing failed.

What happened

This one has no blowout preventer to blame and no captain to put in the dock. Oil terminals, tankers and Kuwaiti wells were destroyed during the Gulf conflict, and crude was released into the sea deliberately, as an act of war.

That is the whole mechanism. There was no equipment fault, no fatigue crack, no misread pressure test. NOAA logs the product simply as Kuwait crude.

Separately and even larger in volume, more than 700 Kuwaiti oil wells were set alight. Those fires burned for the better part of a year, and what they put into the air and onto the desert surface was, by volume, far more than what went into the water.

Why the numbers are so slippery

Every big spill has a contested volume. This one is worse than most.

NOAA’s own figure is a range, 6 to 8 million barrels, which is a spread of two million barrels of uncertainty. Other credible estimates have run lower, in the region of four million, and others considerably higher. That is not sloppiness. It is what happens when you try to measure a release during a war, from multiple sources at once, with no meters on anything and no one able to safely survey the water for weeks.

So a fair statement is this: by the best available estimate it was the largest marine oil spill on record, and the error bars on it are wider than the entire Exxon Valdez.

The Exxon Valdez, for scale, was about 11 million gallons. NOAA’s low estimate here is 252 million.

The bill nobody expected to be paid

Here the story turns, and it turns in a direction environmental accountability stories almost never go.

Usually the pattern for a major spill is a decade of litigation ending in a number far smaller than the damage. Exxon Valdez ran that way: a $5 billion jury award ground down to roughly $500 million by 2008. Ixtoc I ran that way too, with Pemex paying a rounding error.

The Gulf War spill went differently, because it was handled as war reparations rather than as a private lawsuit. The United Nations Compensation Commission was set up to process claims against Iraq, and it did something unusual: it stood up a dedicated body, the F4 Panel of Commissioners, to assess claims for damage to the environment itself.

Roughly $4.3 billion was awarded to Iran, Jordan, Kuwait and Saudi Arabia for environmental remediation and restoration.

Kuwait received the bulk of it, approximately $3 billion, for work including the remediation and revegetation of 114 square kilometres of oil-contaminated desert, plus about $41.5 million to treat the groundwater in Raudhatain and Umm Al-Aish, the country’s only two freshwater aquifers.

Saudi Arabia received roughly $1 billion, of which about $463 million was specifically for damage to the coastal environment from oil released into the Gulf and from contaminants out of the burning wells, and about $619 million for ecological damage to soils and vegetation from military activity.

What is actually remarkable here

Read those line items again. A groundwater award for two named aquifers. A revegetation award measured in square kilometres. A separate figure for soil and vegetation crushed by military traffic.

An international body sat down and decided that a damaged aquifer and a stripped desert surface are injuries a party can be made to pay for in their own right, not just a line item in somebody’s lost fishing income. That is a meaningful precedent, and an important reason to understand how the spill was handled.

The follow-up programme was equally unusual. The awards were not simply handed over. Each government had to run a national focal point filing progress reports twice a year, independent technical reviewers picked those reports apart, and the Commission held back 15 per cent of every project’s value until the work was finished. That is a very different instrument from a lump-sum settlement that vanishes into a treasury.

And the part that stays unpaid

The money came out of Iraqi oil revenues, which means, in practice, it was paid by a population that had no vote in the decision to open the valves. Compensation and accountability are not the same thing, and the gap between them is where most environmental justice arguments live.

The Gulf itself is a shallow, hot, slow-flushing sea with limited exchange with the open ocean, which is close to the worst possible receiving environment for several million barrels of crude. Salt marsh and mudflat habitat took the heaviest hit, and buried oil in sheltered sediments is the kind of contamination that outlasts everyone who argued about it.

The uncomfortable takeaway

We have built an entire framework for oil spills around the idea of accident. Regulators inspect equipment. Courts assign negligence. Companies buy insurance. The whole apparatus assumes that the oil got out because something broke.

The biggest release in history happened because somebody decided it should. No inspection regime catches that. No liability cap prices it. The largest single injury the oceans have taken from oil sits entirely outside the system we built to prevent oil from injuring oceans.

Thirty-five years on, the most valuable thing to come out of it is not the cleanup. It is the paperwork: the first serious international admission that an aquifer, a marsh and a stretch of desert are things a party can be made to pay for.