The 8 Largest Oil Spills in the World

Oil spills cause a significant amount of damage to the environment, wildlife, and local economies. The oil may pollute ecosystems, upset food chains, and choke aquatic plants and animals.

When liquid hydrocarbon from petroleum spills into the environment, often in the ocean, it is referred to as an “oil spill”. Marine oil spills are defined as oil spills that discharge oil into the ocean or coastal waterways. However, spills on land are also possible.

By fouling beaches, marshes, and estuaries and harming economic sectors like fishing and tourism, oil spills may also cause harm to coastal communities. One liter of oil may pollute one million liters of water. Therefore, a small oil spill can result in considerable environmental detriment. The harm brought on by spills lasts for decades, and cleanup attempts can be expensive, time-consuming, and unable to remove all of the oil that has been spilled.

Gulf War Oil Spill

The Gulf War Oil Spill was one of the worst environmental disasters ever caused by human activity. Iraqi forces deliberately discharged crude oil into the Persian Gulf during the Persian Gulf War in 1991 to prevent a US-led attack from the sea.

Onshore oil wells were set ablaze and offshore oil storage units and terminals spilled the crude oil. Most of the oil was released from the Kuwaiti Sea Island Oil Terminal and the Mina al-Ahmadi and the Iraqi Mina al-Bakr oil terminals. The Persian Gulf was inundated by an estimated 11 million barrels of crude oil.

The environment and wildlife in the area suffered immensely due to the oil spill, damaging 800 km of coastline including areas of Saudi Arabia, Iran, Bahrain, and Qatar. The oil damaged the habitats of several marine species, including fish, shellfish, marine mammals, sea turtles and even seabirds. It blanketed hundreds of square kilometers of the Persian Gulf.

Nearby coral reefs and mangroves were either destroyed or severely damaged by the oil. Several beaches in the area were so heavily contaminated that they had to be closed to the public. The oil spill also hurt the local tourism industry.

Thousands of employees and hundreds of ships were part of the major cleanup operation. Despite these efforts, up to 30% of the spilled oil, estimated at around 3.3 million barrels, is believed to still be in the Persian Gulf today, posing a continuing threat to the environment.

Kuwait received billions in compensation funds to address the environmental damage, but bureaucratic delays and the complexity of bioremediation techniques have hampered progress. As of 2021, only a small percentage of the contaminated soil has been successfully removed.

Deepwater Horizon

BP’s Deepwater Horizon oil spill happened in the Gulf of Mexico in April 2010. An explosion and associated fire on the Deepwater Horizon oil rig, which was leased by BP and owned and operated by Transocean, resulted in the BP oil disaster. 11 people were killed, and 17 others were hurt in the incident. The wellhead on the ocean floor continued to spew oil into the Gulf for 87 days after the rig collapsed two days later.

It was the greatest unintentional maritime oil disaster in history, with 4 million barrels of oil spilling into the Gulf of Mexico. Along with areas of Texas and the eastern coast of Mexico, the oil impacted the shores of Louisiana, Mississippi, Alabama, and Florida. The spill caused significant damage to the local fishing, tourism and marine sectors.

Due to a lack of safety precautions and an ineffective reaction, BP received harsh criticism for handling the disaster. It was also determined that BP was principally accountable for the leak. Regarding the spill, the firm consented to pay nearly $20 billion in penalties and compensation.

Countless birds, mammals and sea turtles perished, coated in oil or poisoned after mistakenly ingesting it. This included vulnerable populations like Brown pelicans and Kemp’s Ridley sea turtles. Microscopic organisms at the base of the food chain were wiped out in areas smothered by oil, while larvae of commercially fished species suffered heart defects from oil components. Even vital ecosystems like coral reefs weren’t spared, with oil and dispersants stressing these structures and potentially hindering reproduction.

Ixtoc 1 Oil Well

Ixtoc 1 was an oil well situated in the Gulf of Mexico’s Bay of Campeche. Pemex, the state-owned oil company of Mexico, owned and ran it. The well accidentally blew up on June 3, 1979, resulting in a significant oil leak that lasted almost ten months.

One of the first oil disasters in a tropical marine environment, the Gulf of Mexico received over 3.4 million barrels of crude oil (equivalent to 140 million gallons of crude oil). A critical failure during the drilling process allowed pressure from the oil reservoir to build up unchecked, eventually causing a blowout. On March 23, 1980, the well was finally sealed off, but not before severe harm had been done to the surrounding ecology and fishing economy.

Researchers found a decrease in biomass, primary productivity, and diversity of phytoplankton species. Some species were more affected than others, with small flagellates being particularly susceptible. The impact on fish populations is less clear. Some researchers suggest that the strong estuarine plume and the short life cycles of many fish species in the area may have helped to mitigate the impact of the oil spill.

SS Atlantic Empress

The significant oil spill in 1979 involved the tanker SS Atlantic Empress. The Atlantic Empress collided with the Aegean Captain, another very large crude carrier, on July 19 of that year. The collision caused a significant oil spill off the island of Tobago in the Caribbean Sea.

The collision threatened to release as much as 3.5 million barrels of crude oil into the water. Weeks later, by the 3 August, the Atlantic Empress sank and approximately 1.8 million barrels of oil leaked into the water. The 27 crew members perished in the disaster, while marine life and coastal ecosystems suffered significant harm.

Back then, awareness of marine pollution wasn’t as acute, so no formal impact studies were conducted by nearby countries or the international community. Thankfully, reports only mentioned minor shore pollution on nearby islands. The response focused on containing the spill through firefighting and dispersants, both when it first happened and during the towing process – but no restoration was conducted.

Though a significant portion of the oil burned off, a large slick remained. Aircraft continued spraying dispersants to minimize environmental impact. Fortunately, no major shoreline pollution materialized, and the ongoing Ixtoc I oil rig disaster in the Gulf of Mexico drew some attention away from this event.

Nowruz Field Platform

The Nowruz oil field in the Persian Gulf became a tragic scene of environmental devastation during the peak of the Iran-Iraq War in 1983. Two separate incidents, both heavily influenced by the ongoing conflict, resulted in a massive oil spill. The first occurred in February when a supply vessel collided with a platform, causing a rupture and a leak of approximately 1,500 barrels of crude oil per day. Capping the leak proved a nearly impossible task due to constant attacks from Iraqi aircraft on the platform. It wasn’t until September 1983, after months of leaking oil, that Iranian crews were finally able to cap the well, but not without the loss of eleven lives.

The second major spill occurred just a month later when another platform in the Nowruz field was targeted by Iraqi helicopters. This attack resulted in a fire that raged for two years, spewing an estimated 733,000 barrels of oil into the Persian Gulf. Capping this well also proved a dangerous and deadly undertaking, with nine lives lost during the capping and firefighting operations in March 1985.

The warzone conditions in the Persian Gulf severely hampered response efforts to both spills. Traditional methods like skimmers and booms were largely ineffective, and only a small fraction of the spilled oil could be recovered. The vast majority, estimated at around two-thirds of the total volume, sank to the seafloor, forming tar balls that posed a long-term threat to the marine ecosystem.

ABT Summer

ABT Summer, an oil tanker, encountered an explosion on May 28, 1991, about 700 nautical miles off the coast of Angola. The tanker caught fire and released roughly 1.9 million barrels of oil into the water. The catastrophe resulted in oil slicks covering over 80 square miles. Five of the 32 crew members died after the tanker sank after burning for three days.

The ABT Summer oil spill avoided a major environmental disaster thanks to its offshore location. Rough seas at the accident site naturally broke up the oil slick, minimizing the need for extensive cleanup efforts. Additionally, the distance from the coast meant the oil wouldn’t reach sensitive coastal ecosystems. Experts anticipated natural processes like evaporation would further break down the oil before it could cause significant harm to the marine environment.

Amoco Cadiz Oil Spill

The Amoco Cadiz oil spill was one of the worst in history, occurring on March 16, 1978, when the giant tanker Amoco Cadiz ran aground off the coast of Brittany, France. The spill was caused by a steering failure during a severe storm, which left the ship unable to navigate. The tanker eventually broke apart, releasing its entire cargo of crude oil—about 1.6 million barrels—into the sea.

The spill devastated marine life along 200 miles of French coastline, including oyster beds, fish populations, and local seabird species. The thick layers of oil washed ashore, affecting sandy beaches and rocky coves, causing long-term damage to the local ecosystem and economy. Fishing and tourism industries in the area were severely impacted. The massive scale of the spill and its devastating environmental consequences led to changes in international maritime regulations, including the development of stricter safety measures and improvements in oil spill response techniques.

The Amoco Cadiz disaster remains a poignant reminder of the catastrophic environmental impacts oil spills can cause, particularly to coastal and marine ecosystems.

Castillo de Bellver

The Castillo de Bellver oil spill was one of the largest maritime oil spills in history, caused by the sinking of the Spanish tanker Castillo de Bellver off the coast of South Africa in 1983.

On August 6, 1983, The Castillo de Bellver, a fully laden oil tanker carrying 252,000 metric tons of light crude oil, caught fire and eventually sank about 70 miles off the coast of South Africa. The vessel split into two sections as a result of the fire, and the stern section, containing the majority of the oil cargo, sank to the ocean floor in deep waters. The bow section drifted before being towed further offshore and scuttled

Despite the large quantity of oil spilled, the environmental impact was surprisingly limited. The location of the spill, in open ocean with strong currents, helped disperse the oil. Much of the oil burned off during the fire, while the remainder spread over the ocean surface and did not reach the shoreline.

Due to the deep-sea sinking of the stern section and the natural dispersion of oil in the ocean currents, active cleanup efforts were not heavily required. The fact that the oil did not come into contact with sensitive coastal ecosystems mitigated much of the potential damage.

FAQs