Offshore drilling accidents history

Offshore drilling accidents history: The most lethal element in offshore life often comes from harsh weather conditions and the daily threat of an unforgiving ocean.

The most notorious offshore incident, Deepwater Horizon, had a death toll far smaller than the worst offshore rig disasters. Credit- US Coast Guard.
The most notorious offshore incident, Deepwater Horizon, had a death toll far smaller than the worst offshore rig disasters. Credit- US Coast Guard.


Offshore drilling accidents history:

Workers exert astronomical pressure on the earth’s foundation, using power to drill and extract the planet’s natural resources deep within the ground. Whether offshore in the Gulf or in the oilfields of West Texas and the Northeastern United States, oil rig workers are among the most skilled and most at-risk workers in the nation.

Oil companies must take extreme precaution during all parts of the drilling process to avoid disaster. Even one mistake or missed safety procedure can lead to a catastrophic blowout. Unfortunately, oil companies often cut corners to save time and money. In doing so, they put the lives of the workers at risk. Fires and explosions that occur on oil rigs are some of the most devastating types of offshore accidents that can ever happen. The injuries workers sustain from oil rig accidents result in long-term consequences for themselves and their families.

Offshore platform and rig disasters make many people think of massive explosions and oil slicks. In reality, the most lethal element in offshore life often comes from harsh weather conditions and the daily threat of an unforgiving ocean. In many of the worst disasters, these elements claimed the most lives, helped by bad equipment design, fumbled emergency procedures, and poor enforcement of protocols.

Thankfully, greater emphasis on safety and better knowledge of risks have made offshore disaster less common and less severe. Countries have improved their offshore regulations and created better equipment as a result of the disasters below, but these come as a result of hundreds of deaths.

Some of the disasters below have relatively little reliably information available. Some governments work with the seas to wash away what happened, but often the chaos of an emergency is enough to obscure the truth. Here, we give an overview of the offshore platform and rig disasters that directly caused the most fatalities, and how they came to happen.

Burning and skimming operations in the Gulf of Mexico, 10 June, 2010, Credit - kris krüg, Wikipedia
Burning and skimming operations in the Gulf of Mexico, 10 June, 2010, Credit – kris krüg, Wikipedia


C.P. Baker Drilling Barge disaster, Gulf of Mexico, 1964

The C.P. Baker Drilling Barge disaster in the Gulf of Mexico on 30 June 1964 resulted in the deaths of 21 people and injuries to 22 others

Pan American Petroleum Corp issued contracts for the barge to drill in the Eugene Island are of the Gulf of Mexico. On the morning of 30 June 1964, the two 260ft-long hulls suffered a blowout. Water gushed into the vessel through open doors on the main deck and the barge lost electricity soon thereafter.

The entire barge was engulfed with fire and explosion minutes later. Only 22 out of the total 43 crew onboard survived the disaster, most of whom saved their lives by jumping from the port bow. The vessel sank upside-down in the water after approximately 30 minutes. The rescue operation confirmed eight as dead, with 13 crew missing.



The Santa Barbara Oil Spill (January 1969)

In January 1969, Union Oil began drilling a fifth oil well on their offshore Platform A, just over five miles from the coast of Santa Barbara, CA. On the morning of January 28, the well blew out, spewing oil and gas. The explosion cracked the sea floor in 5 places and released 1,000 gallons of oil an hour. A second blow out in a different well followed on February 24th. Eventually, the California coastline would be devastated by 3 million gallons of crude—the largest oil spill in the nation’s history until the Exxon Valdez 20 years later.

The destruction was both so immense and so visible that it sparked the environmental advocacy movement as we know it. The spill led to the signing of the National Environmental Policy Act, which required the creation of environmental impact reports on major projects. The spill created a cultural moment, too. For the first time, regular Americans were deeply concerned with environmental health. The following year marked the first time the U.S. celebrated Earth Day.

Thunder Horse, 2005 The 15-story oil platform in the Gulf of Mexico pitched in rough seas in the wake of Hurricane Dennis, tilting dangerously
Thunder Horse, 2005 The 15-story oil platform in the Gulf of Mexico pitched in rough seas in the wake of Hurricane Dennis, tilting dangerously


Bohai 2 oil rig disaster, Gulf of Bohai, China, 1979

The sixth most fatal oil rig disaster happened in the Gulf of Bohai, off the coast of China, in November 1979. This disaster caused the death of 72 out of 76 people on board the Bohai 2 jack-up rig when it capsized.

As a towing ship moved the rig, a storm set in. Fierce winds broke the ventilator pump of the platform, causing a puncture hole in the deck and extensive flooding. The resulting loss of stability coupled with severe weather conditions eventually led to the jack-up capsizing. The accompanying tow boat could not rescue the crew members, who did not have proper training in emergency evacuation procedures and the use of lifesaving equipment.

Investigations that followed reported a failure to correctly stow deck equipment prior to towing. It was also reported that standard tow procedures for bad weather conditions were not followed, possibly because operating instructions for the Japanese-made rig were not translated into Chinese until after the incident. The sunken jack-up rig was eventually salvaged by the Yantai Salvage Company in April 1981.

See also: US reaction when China disclosed the death toll the following year.

The top five biggest oil spills and lessons to learn, Credit- Justin Stumberg.
The top five biggest oil spills and lessons to learn, Credit- Justin Stumberg.


The Alexander L. Kielland Disaster (March 1980)

The semi-submersible platform Alexander L Kielland gave accommodation to 212 workers on the evening of 27 March 1980. Of these, 123 workers aged between 19 and 57 died when the floating hotel capsized.

A bridge linked the ‘flotel’ to the Edda 2/7C drilling platform, extracting on the Ekofisk field in the middle on the North Sea. Ekofisk lies approximately 235 miles east of Dundee, Scotland, on the Norwegian continental shelf.

Rain pounded the platform on the day of the incident, with strong winds creating waves up to 12m high. Shortly before 6.30pm, five of the platform’s cables securing the platform to the sea floor snapped. One of the platform’s five legs broke away, leaving it off-balance by 30° and at risk of capsizing.

Evacuations immediately began, but several lifeboats failed to launch because of their design . The platform was stabilised for 14 minutes by the single remaining cable, which ultimately snapped, and the platform rolled over.

In total, only 89 people on the platform that night survived the disaster. An official investigation found that poor welding and overloading on the platform’s D column caused cracking in its bracings. Eventually, harsh weather wore away at this and tore the leg off. The investigation also decided that a better command structure could have saved more lives in the 14 minutes after the first tilt.

US-based Phillips Petroleum operated the platform when it capsized, and ConocoPhillips still operates in the area. The company emphasises that it has improved safety since, aiming to never have another major disaster.

As a result of the Kielland disaster, Norway restructured and combined the authorities responsible for overseeing offshore activity. Five years later, it made offshore operators directly responsible for their employees’ safety. The event still marks the worst industrial accident in Norway’s history.

The Ocean Ranger, on the Hibernia J-34 well off Eastern Canada during December 1981, is shown at the 80-foot drilling draft
The Ocean Ranger, on the Hibernia J-34 well off Eastern Canada during December 1981, is shown at the 80-foot drilling draft


The Ocean Ranger Disaster (February 1982)

Early in the morning of 15 February 1982, 84 crew members died in the Ocean Ranger disaster. They were aboard the rig when it capsized and sank in the North Atlantic Sea, off the coast of Newfoundland, Canada.

At the time, the 25,000t rig was the largest of its kind, measuring 396ft long, 262ft wide, and 337ft tall. The semi-submersible mobile oil drilling could operate 1,500ft underwater, drilling up to 25,000ft below the seabed.

Mobil Oil of Canada hired rig owner Ocean Drilling and Exploration Co. (ODECO) to use the rig for an exploration well on the Hibernia field. The day before the disaster, a strong storm developed, producing winds of 190km/h and waves up to 20m high. Nearby rigs reported unusually large waves.

These nearby rigs later overheard radio chatter speaking of damage to the Ocean Ranger. Later, the Ranger’s crew confirmed that a porthole window had broken, allowing water to enter the ship’s ballast control room. However, the crew did not believe this to be serious. Soon after, the ballast control panel was noticed to be malfunctioning.

At 1am, the Ocean Ranger’s senior manager radioed the shore to say the rig had started listing, and that the standby vessel should move closer to its position. Mayday calls began ten minutes later, and the rigs final transmission came at 1.30am, saying crew had moved to lifeboats.

Only one lifeboat with 36 crew members inside could successfully launch. After staying afloat for 1.5 hours, the rig sank between 3:07am and 3:13am, leaving at least 20 crew in the water. The lifeboat came close to reaching its supply vessel, but a line between the vessels snapped in the storm. The boat floated away before anyone could be rescued.

This lifeboat was later seen during rescue operations, but again it could not be reached. This was the last time it was seen. All 84 workers aboard the Ocean Ranger died.

Later, a royal commission concluded that “a chain of events, which resulted from human error, design inadequacies and deficiencies within the management system, coincident with severe storm conditions” caused the disaster. It made 136 recommendations to prevent future incidents, including better training, design and safety equipment for rigs.

All 84 of the crew, including 46 Mobil employees and 38 contractors, were killed. Investigators found that nearby vessels were not equipped to rescue casualties from the sea, especially in severe weather, so most of the crew died from drowning or hypothermia.

See also: The two divers who died attempting to move the wreckage; A more detailed look at the response to the Ocean Ranger disaster.

The fire broke out while maintenance work was being carried out
The fire broke out while maintenance work was being carried out


Glomar Java Sea drillship disaster, South China Sea, 1983

Six years before the Seacrest disaster, the Glomar Java Sea Drillship overturned in the South China Sea on 25 October 1983. This caused the deaths of 81 people when the drillship capsized and sank approximately 63 nautical miles south-west of Hainan Island, China, 80 nautical miles east of Vietnam.

The Levingston Shipbuilding Company of Orange, Texas, built the 5,930t Glomar Java Sea drillship in 1975. The company delivered the 400ft-long drillship to US-based company Global Marine, contracted to ARCO China at the time of the disaster. The vessel drilled for ARCO in the Gulf of Mexico between 1975 and 1881, operating off the coast of California for some time before its arrival in the South China Sea in January 1983.

As tropical storm Lex as approached the drilling site from the east, operations ceased. Global Marine’s office in Texas reported that the drillship experienced winds up to 140km/h over the bow, before contact was abruptly lost.

The wrecked drillship was found floating upside-down 1,600ft south-west of the drilling site. An extensive search operation followed, though Chinese, US, and Vietnamese rescuers found no survivors. Of the 81 crew, only 36 bodies were recovered.

See also: A transcribed news article from the time

The Deepwater Horizon explosion is the most infamous rig blowout disaster in the recent history. Credit - US Coast Guard.
The Deepwater Horizon explosion is the most infamous rig blowout disaster in the recent history. Credit – US Coast Guard.


Enchova Central Platform disaster, Brazilian Atlantic Ocean, 1984

Petrobras currently operates the Enchova field, just as it did in 1984. When a fire broke out and explosions started on the Enchova Central Platform on 16 August 1984, crews reacted quickly and moved to evacuate. Despite the peril, it was the evacuation that caused the deaths of 42 people.

Fires began after drill pressure controls failed to contain their compressed oil reserves, known as a blowout. Lifeboats and helicopters evacuated most of the platform’s workers. One lifeboat’s bow hook lowering mechanism malfunctioned during the evacuation, leaving it hanging vertically. Eventually, the boat’s supporting cables snapped and it fell 20m into the sea, killing 36 people. Another six workers died after attempting to escape by jumping from the platform into the sea.

The Enchova Central Platform suffered another blowout on 24 April 1988. During work to convert the platform from oil production to gas production, on one of its 21 wells blew out before igniting. The fire led to massive damage topside, though all workers safely evacuated to a nearby floating accommodation ship without a single casualty.

The platform remained on fire for a month. Petrobras eventually drilled two relief wells to control the blowout, before declaring the platform a total loss. The company replaced it with a new facility, commencing production nearly 18 months after the second accident.

The Alexander L Kielland and Edda 2-7C platform
The Alexander L Kielland and Edda 2-7C platform


Piper Alpha, UK North Sea, 1988

In 1988, explosions on the Piper Alpha oil platform in the British North Sea killed 167 people. This became the deadliest offshore oil rig accident in history.

After explorers discovered crude reserves in 1973, a joint venture started operations on the UK Continental Shelf in 1976. US-based Occidental managed Piper Alpha, located 120 miles north-east of Aberdeen. One of the UK’s largest offshore oil platforms, Piper Alpha produced more than 300,000 barrels of crude oil per day at its peak. At the time, this represented approximately 10% of the country’s total crude oil production.

In the early 1980s the offshore platform started producing gas, with three main gas transport risers and an oil export riser.

The Piper Alpha disaster began on 6 July 1988, following a gas leak from one of the platform’s condensate pipes. Engineers had removed the pressure safety valve of the corresponding condensate-injection pump as part of routine maintenance earlier in the day. During the work, the open condensate pipe was temporarily sealed with two large metal caps, known as blind flanges.

When the maintenance crew’s shift ended, the work remained incomplete and the temporary covers remained in place. The engineers used work permits to notify the evening crew that the condensate-injection pump they had worked on should not be switched on under any circumstances.

Somehow, this message was lost. The night crew turned on the dangerous pump after another pump failed, resulting in the leakage of gas condensate from the two blind flanges. The gas then ignited, and while automatic fire control measures would usually dampen the flames, crews had disabled these during maintenance.

Explosions on the platform began just after 10pm. An emergency stop quickly halted all extraction, but the initial explosion devastated the platform’s control room. Piper Alpha’s oil extraction design could not withstand gas explosions, leaving crew vulnerable and preventing them from attempting to control the fire.

A mayday call soon followed. At this time, there were 226 workers on the platform, though only 61 would survive the disaster. Two rescuers also died in their attempt to help, and bringing the fire under control took three weeks.

A public enquiry made 106 recommendations to help prevent future incidents, including greater clarity over work permits, more robust fire suppression systems, and forming a single regulator for offshore safety. According to the report, the company had inadequate safety measures in place at the time, though Occidental never faced criminal charges.

Piper Alpha Disaster Memorial
Piper Alpha Disaster Memorial


Seacrest Drillship disaster, South China Sea, 1989

The Seacrest Drillship disaster in the South China Sea killed 91 crew members on 3 November 1989. The 4,400t drillship was anchored 430km south of Bangkok, Thailand, to drill the Platong gas field. That night, Typhoon Gay produced 40ft-high waves, eventually causing the drillship to capsize.

The drillship, also known as The Scan Queen, had operated in the Gulf of Thailand since 1981 for US-based Unocal. The drillship was reported missing on 4 November 1989 and only found floating upside-down by a search helicopter the next day.

Absolutely reliable information on the disaster is hard to come by, but the capsizing was believed to have occurred too quickly to radio a distress signal or for crew to respond to the disaster. The ship’s ‘unseaworthy’ design meant that it had a high centre of gravity when loaded with drill pipe, making it prone to toppling in a storm. Often similar vessels would lay down their pipes in storms to minimise the risks, but Unocal allegedly forbade this.

Only six of the crew were rescued by fishing boats and the Thai Navy. Unocal also faced criticism for not having a standby support vessel ready, despite regulations.

Oil spill disasters have a huge negative impact on the marine species, Credit - anankkml,
Oil spill disasters have a huge negative impact on the marine species, Credit – anankkml,


Mumbai High North disaster, Arabian Sea, 2005

On 27 July 2005, 22 people died in the Mumbai High North rig disaster in the Arabian Sea, around 160km west of Mumbai. India’s state-owned Oil and Natural Gas Corporation (ONGC) operated the Mumbai High North rig, one of the producing platforms on the Mumbai High field. The rig caught fire after a collision with the multipurpose support vessel Samudra Suraksha.

Strong ocean swells pushed the vessel towards the platform. When the vessel’s stern hit the rig, it ruptured one or more of the platform’s gas export risers. The resultant gas leakage ignited, burning the rig and damaging the vessel as well as the Noble Charlie Yester jack-up rig that drilled nearby.

The accident caused a large oil spill, negating production of 120,000 barrels of oil and 4.4 million cubic metres of gas per day. ONGC opened a new platform at Mumbai High North in October 2012.

Oil Rig Disasters
Oil Rig Disasters


Usumacinta Jack-up disaster, Mexican Gulf of Mexico, 2007

A collision between a rig and a platform caused the deaths of 22 workers on 23 October 2007 in the Bay of Campeche, Gulf of Mexico.

PEMEX contracted the Usumacinta Jack-up rig to moved alongside its Kab-101 platform to complete drilling of the Kab-103 well. While there, a storm developed bringing winds of 130km/h and waves as high as 8m. PEMEX director of exploration and production Carlos Morales described the storm as “extreme weather conditions we’ve never registered before”.

The rig’s anchor points were not fully secured, so the rig soon broke free and began oscillating with the seas. The Usumacinta’s cantilever deck then hit the production valve tree on the Kab-101 platform. The resulting in oil and gas leakage lead to the closure of safety valves on two production wells at the platform. However, crew members could not seal the valves completely and the leaks continued. Oil and gas then ignited, and the 73 crew moved to evacuate in two lifeboats.

Soon after, one of the lifeboats began filling with water, eventually capsizing. A large wave overturned the other lifeboat, which reached the shore upside-down the next day with 12 survivors on top. During evacuation, 21 people died. One worker went missing in the rescue operation.

The Usumacinta Jack-up also suffered two more fire breakouts in the following month, during well control operations. These fires were extinguished without any further loss of life and the well was brought back under control by the middle of December 2007. PEMEX reported losing approximately 5,000 barrels of oil from the well.

Oil Rig Disasters
Oil Rig Disasters


Special mention: Deepwater Horizon disaster, Gulf of Mexico, 2010

The Deepwater Horizon incident killed 11 rig workers, but remains far less lethal than most offshore disasters. However, because of its location, timing, and the ensuing oil slick, it remains the most well-known offshore disaster to date.

The explosion on BP’s Deepwater Horizon rig on 20 April 2010 caused the biggest oil spill in US history. Four million barrels of oil spilled into the Gulf of Mexico, harming huge numbers of sea birds and damaging coastlines for hundreds of miles.

Transocean owned the Deepwater Horizon, an ultra-deepwater semi-submersible offshore drilling rig. Hyundai Heavy Industries built the rig in South Korea in 2001, at a cost of $350m. Leased by BP, the rig worked in 5,000ft-deep waters after completing the drilling of the 13,000ft-long Macondo exploration well in the Gulf of Mexico, 66km off the coast of Louisiana, US.

On the night of 20 April, a sudden rush of natural gas blasted through the concrete core of the well and caused the rig to explode. This killed 11 of the 126 on board, injuring several others.

After burning for 36 hours, the drilling rig capsized and sank on the morning of 22 April. This ruptured the oil riser from the seabed, leaving 1,000 barrels of oil spilling into the Gulf every day. The damaged well was finally capped with a 40-ton plug on 15 July, with the oil slick lasting 87 days.

BP spent $14bn on response and clean-up activities between 2010 and 2015 and continued to pay millions in compensation annually. The company committed $1.3bn to natural resource damage assessments and up to $1bn for early restoration of natural resources. It also paid $6.67bn through the Gulf Coast Claims Facility, a trust fund established by BP to settle claims from the Deepwater Horizon oil spill.

Additionally, in April 2016 the US District Court for the Eastern District of Louisiana finalised BP’s liability as part of a Consent Decree. This mean that BP would pay the US Federal Government and five US Gulf Coast states an $18.7bn settlement. In total, BP paid more than $65bn for the Deepwater Horizon disaster.

Oil Rig Disasters
Oil Rig Disasters


There have been dozens of tragic accidents like these in the offshore drilling industry:

June 1979

Mexico’s government-owned oil company, Pemex, used a semi-submersible drilling rig to create Ixtoc I, an exploratory oil well 62 miles off the coast of Campeche, Mexico. On June 3, the well experienced a blowout, initially leaking 30,000 barrels of oil into the gulf each day. Though various efforts were undertaken to lessen the leakage, the spill remained uncontained until March 1980.

Oil Rig Disasters
Oil Rig Disasters


August 1984 & April 1988

Petrobras’ Enchova drilling platform, operating in the Campos Basin near Rio de Janeiro, Brazil experienced its first disaster in 1984 when a blowout on the morning of August 16 led to an explosion and fire. 42 workers died in the evacuation, including 36 who fell from a lifeboat when its mechanism failed. Less than four years later, in April 1988, the well suffered a gas blowout while being converted from oil to gas. The drill pipe was forced out of the well and struck a platform leg, causing sparks to ignite the gas. The resulting fire burned for 31 days, but the crew members were able to abandon the platform without casualty.



July 1988

Occidental Petroleum’s Piper Alpha oil production platform exploded in the North Sea after a series of malfunctioning parts and a small gas leak ignited under pressure. Eventually, the pipeline connecting Piper to the Claymore Platform burst and the Piper slipped into the sea. Of the 224 crewmembers, 165 were killed and 2 rescue vessel crewmen also perished. Only 59 individuals survived. At the time of the accident, the Piper was contributing approximately 10% of the North Sea’s oil and gas production.

Ixtoc I oil spill, Credit - Collection of Doug Helton, NOAA, NOS, ORR, Wikipedia
Ixtoc I oil spill, Credit – Collection of Doug Helton, NOAA, NOS, ORR, Wikipedia

November 1989

Typhoon Gay overtook the Seacrest, a drilling ship belonging to UNOCAL (which merged with Chevron in 2005.) The Seacrest capsized and floated for several days before sinking, killing 91 of the 97 crewmembers.

March 2001

Petrobras’ P-36 oil platform, the largest semi-submersible in the world at the time, experienced two back-to-back explosions which killed 11 of the 175 workers. After the explosions, the platform began to list, finally sinking five days later.

Exxon Valdez Oil Spill Trustee Council,NOAA, ID- line1532
Exxon Valdez Oil Spill Trustee Council,NOAA, ID- line1532


July 2005

A multi-purpose support vessel crashed into Indian government-owned Mumbai High North platform. An explosion and massive fire resulted. The platform was evacuated and destroyed within two hours. 22 of the 384 workers onboard were killed.

August 2009

Oil began to leak from Seadrill’s West Atlas rig in the Timor Sea off the coast of Australia. All workers were evacuated, but the resulting oil slick spreads over 2300 square miles of water, killing marine life in affected areas. The leak was not plugged until 11/1.



September 2010

Mariner Energy’s Vermillion Oil Rig 380 exploded off the coast of Louisiana, just 200 miles east of the site where the Deepwater Horizon tragedy occurred. A supply ship rescued all 13 crewmembers. None were seriously injured.

January 2012

Chevron Nigeria Limited oil rig experienced an explosion six miles off the coast of the African nation. The fire was still burning three days later. As of January 20, 2012, two workers were still missing and presumed dead. Fish were dying in large numbers, and coastal residents were scared to eat living marine animals as they may have been contaminated.

Deepwater Horizon drilling rig before the explosion
Deepwater Horizon drilling rig before the explosion


February 2015

An oil rig owned by Petrobras exploded off of the Brazilian coast. The incident killed 5 workers and injured more than 25 others.

April 2015

A Gulf of Mexico oil rig explosion killed 4 workers and injured 45 others. Pemex operated the rig. Approximately 300 workers were evacuated from the platform after the fire broke out overnight.



December 2015

A fire broke out in the Gunashli oilfield after a storm damaged a high-pressure subsea gas pipeline. The fire spread to multiple wells; eventually, production was suspended, pipelines closed, and electricity shut off. More than 60 workers were onboard at the time of the incident. The Ministry of Emergency Situations of Azerbaijan reported 10 killed, 20 missing, and 9 hospitalized.

Oil Rig Disaster FAQ


Mechanically, the answer is the blowout preventer was damaged. It hadn’t been inspected in five years, and it had suffered an unreported accident a month prior to the Deepwater Horizon incident. On the night of the explosion, a methane gas bubble was able to travel up the drilling platform due to the damaged blowout preventer. The human element in all this was the fact that BP was weeks behind schedule, tens millions of dollars over budget, and taking dangerous shortcuts that eventually resulted in mistakes that led to the fatal explosion.

An offshore oil spill is the release of liquid petroleum hydrocarbon into the ocean or coastal waters. Credit-
An offshore oil spill is the release of liquid petroleum hydrocarbon into the ocean or coastal waters. Credit-



In terms of sheer loss of life, the Piper Alpha disaster is the deadliest offshore oil rig disaster ever recorded. On July 6, 1988, there was a pump maintenance project that led to the removal of a safety valve on a gas pipe. The pipe was temporarily sealed, and the pump was ordered to be left off until the project could be completed. However, due to a communication error, the next shift crew turned on the pump. This led to a gas leak that created a series of massive explosions. The explosions killed 167 people, leaving only 61 survivors of a 226-person crew.


Oil rig explosions are like plane crashes: they are rare, but when they occur, there’s usually a tremendous loss of life. Greg McCormack, director of the Petroleum Extension Service at the University of Texas, said “These events are low probability with a high consequence.” Like plane crashes, oil rig explosions are almost always due to human error, which is why it’s vital to hold oil companies accountable when something goes terribly wrong.

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