Ten years after an oil rig explosion killed 11 workers and unleashed an environmental nightmare in the Gulf of Mexico, companies are drilling into deeper and deeper waters, where the payoffs can be huge but the risks are greater than ever.
Industry leaders and government officials say they're determined to prevent a repeat of BP's Deepwater Horizon disaster.
The explosion spilled 134 million gallons of oil that fouled beaches from Louisiana to Florida, killed hundreds of thousands of marine animals and devastated the region's tourist economy.
However, safety rules adopted in the spill's aftermath have been eased as part of President Donald Trump's drive to boost U.S. oil production.
Government data reviewed by The Associated Press shows the number of safety inspection visits has declined in recent years, although officials say checks of electronic records, safety systems and individual oil rig components have increased.
Today companies are increasingly reliant on production from deeper and inherently more dangerous oil reserves, where drill crews can grapple with ultra-high pressures and oil temperatures that can top 350 degrees (177 degrees Celsius).
Despite almost $2 billion in spending by the industry on equipment to respond to an oil well blowout like BP's, some scientists, former government officials and environmentalists say safety practices appear to be eroding.
There are also worries that cleanup tactics have changed little in decades and are likely to prove as ineffective as they were in 2010.
Regulators and industry leaders say they've employed lessons from the April 20, 2010, disaster to make deep-water drilling safer by setting tougher construction and enforcement standards.
Companies have a financial interest in preventing a repeat of the 2010 disaster, which cost BP more than $69 billion in cleanup, fines, fees and settlements.
Questions over environmental effects linger, and litigation continues over health problems suffered by cleanup workers.
Competing oil giants joined together in the disaster's wake to create the Marine Well Containment Co., which has equipment and vessels positioned region-wide to quickly corral oil if another major spill occurs.
The hope is that such equipment won't be needed.
Yet the Trump administration has relaxed regulations adopted in 2016, including the frequency of drilling rig safety tests, which is projected to save energy companies roughly $1.7 billion in compliance costs over a decade.
An AP review found the number of safety inspection visits by the U.S. Bureau of Safety and Environmental Enforcement, which was created after the spill, have gone down more than 20% over the past six years.
Industry advocates say inspection figures reflect greater emphasis on complex systems that influence safety rather than minor technical matters, and note there are fewer, if bigger, active oil platforms.
Advocates say the administration's rule changes allow companies to deviate from "one-size-fits-all" standards not always suited to water pressure and other conditions at individual wells.
Environmentalists and critics say the changes appear to be eroding safety practices adopted after the spill - even as drilling moves to deeper water.
Oil rigs drill deeper 10 years after deadly BP's Deepwater Horizon disaster
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