When the Deepwater Horizon oil rig sank in the Gulf of Mexico on April 22, no one was prepared for the massive environmental disaster that followed. Now that BP has successfully capped the gushing oil well — a temporary fix until relief wells are completed — we can see how the Gulf oil spill, the worst environmental disaster in U.S. history, stacks up against the world's worst oil spills.
13. The Torrey Canyon Oil Spill
When: March 18, 1967
Where: Scilly Isles, UK
Amount spilled: 25-36 million gallons
The Torrey Canyon was one of the first big supertankers, and it was also the source of one of the first major oil spills. Although the ship was originally built to carry 60,000 tons, it was enlarged to a 120,000-ton capacity, and that’s the amount the ship was carrying when it hit a reef off the coast of Cornwall.
The spill created an oil slick measuring 270 square miles, contaminating 180 miles of coastland. More than 15,000 sea birds and enormous numbers of aquatic animals were killed before the spill was finally contained.
Toxic solvent-based cleaning agents were used by Royal Navy vessels to try to disperse the oil, but that didn't work very well and instead caused a great deal of environmental damage. It was then decided to set fire to the ocean and burn away the oil by dropping bombs.
12. The Sea Star Oil Spill
When: Dec. 19, 1972
Where: Gulf of Oman
Amount spilled: 35.3 million gallons
11. Odyssey Oil Spill
When: Nov. 10, 1988
Where: Off the coast of Nova Scotia, Canada
Amount spilled: 40.7 million gallons
10. M/T Haven Tanker Oil Spill
When: April 11, 1991
Where: Genoa, Italy
Amount spilled: 45 million gallons
9. ABT Summer Oil Spill
When: May 28, 1991
Where: About 700 nautical miles off the coast of Angola
Amount spilled: 51-81 million gallons
This ship exploded off the coast of Angola, discharging massive amounts of oil into the ocean. Five of the 32 crew members on board died as a result of the incident. A large slick covering an area of 80 square miles spread around the tanker and burned for three days before the ship sank on June 1, 1991. Subsequent efforts to locate the wreckage were unsuccessful.
8. Amoco Cadiz Oil Spill
When: March 16, 1978
Where: Portsall, France
Amount spilled: 69 million gallons
7. Castillo de Bellver Oil Spill
When: Aug. 6, 1983
Where: Saldanha Bay, South Africa
Amount spilled: 79 million gallons
The Castillo de Bellver caught fire about 70 miles north west of Cape Town, and drifted in the open sea until it broke in two 25 miles off the coast. The ship’s stern sank along with the 31 million gallons of oil it was carrying. The bow section was towed and deliberately sunk later.
6. Nowruz Oil Field Spill
When: Feb. 10, 1983
Where: Persian Gulf, Iran
Amount spilled: 80 million gallons
5. Kolva River Oil Spill
When: Aug. 6, 1983
Where: Kolva River, Russia
Amount spilled: 84 million gallons
4. Atlantic Empress Oil Spill
When: July 19, 1979
Where: Off the coast of Trinidad and Tobago
Amount spilled: 90 million gallons
This Greek oil tanker was caught in a tropical storm off the coast of Trinidad and Tobago when it collided with the Aegean Captain. The damaged ship started losing oil and continued to leak it into the ocean while it was towed. The oil tank finally sunk into deep water on Aug. 3, 1979, where the remaining cargo solidified.
3. Ixtoc 1 Oil Spill
When: June 3, 1979
Where: Bay of Campeche off Ciudad del Carmen, Mexico
Amount spilled: 140 million gallons
Like the Gulf oil spill, this spill didn't involve a tanker, but rather an offshore oil well. Pemex, a state-owned Mexican petroleum company was drilling an oil well when a blowout occurred, the oil ignited and the drilling rig to collapse. Oil began gushing out of the well into the Gulf of Mexico at a rate of 10,000 to 30,000 barrels a day for almost an entire year before workers were finally able to cap the well.
2. Gulf oil spill
When: April 22, 2010
Where: Gulf of Mexico
Amount spilled: An estimated 206 million gallons
The Gulf oil spill is officially the largest accidental spill in world history. It began when an oil well a mile below the surface of the Gulf blew out, causing an explosion on BP’s Deepwater Horizon rig that killed 11 people. BP made several unsuccessful attempts to plug the well, but oil flowed — possibly at a rate as high as 2.5 million gallons a day — until the well was capped on July 15, 2010. Oil gushed from the broken well for more than 85 days, oiled 572 miles of Gulf shoreline, and killed hundreds of birds and marine life. The long-term effects of the oil and the 1.82 million gallons of dispersant used on this fragile ecosystem remain unknown, but experts say they could devastate the Gulf coast for years to come.
1. Arabian Gulf/Kuwait
When: Jan. 19, 1991
Where: Persian Gulf, Kuwait
Amount spilled: 380-520 million gallons
How does the Exxon Valdez oil spill compare?
When the Exxon Valdez supertanker hit a reef off the Alaskan coast, 11 of its cargo tanks ruptured, dumping 11 million gallons of crude into Prince William Sound. But the spill could have been much worse — the Valdez was carrying 53 million gallons.
In terms of sheer volume, the Exxon Valdez spill ranks as the 36th worst oil spill in history; however, the spill was far from small. Despite attempts to use dispersing agents and oil skimming ships, oil washed onto 1,300 miles of Alaskan coastline. Today, oil remains a few inches below the surface on many of Alaska’s beaches.
Responders found carcasses of more than 35,000 birds and 1,000 sea otters, which was considered to be a fraction of the animal death toll because carcasses typically sink to the seabed. It’s estimated 250,000 seabirds, 2,800 sea otters, 300 harbor seals, 250 bald eagles, up to 22 killer whales died along with billions of salmon and herring eggs.
The repaired Exxon Valdez was renamed the SeaRiver Mediterranean, and, although it is banned from Alaskan waters, the tanker still carries oil around the world.
(MNN editor Catie Leary contributed to this story.)
Photos: NOAA, ZUMA Press