On April 20, 2010, the Deepwater Horizon, an oil drilling rig operated by the private contractor Transocean, prepares to commence operations off the southern coast of Louisiana on behalf of BP. Crew members Michael "Mike" Williams (Mark Wahlberg) and his superior, James "Jimmy" Harrell (Kurt Russell), are taken aback when they discover that the Schlumberger workers, responsible for pouring the critical concrete foundation to ensure the well's stability, are being dismissed early without conducting the necessary pressure tests. This early dismissal is insisted upon by Donald Vidrine (John Malkovich), a BP liaison, as the well is already 49 days behind schedule and there is significant pressure from corporate leaders to commence production ASAP, even at the risk of bypassing essential safety protocols.
As Mike prepares the drilling team, including the inexperienced Caleb Holloway (played by Dylan O'Brien), Harrell engages with Vidrine and convinces him to proceed with a test. Unfortunately, this test only exacerbates the instability of an already failing foundation. Just as Harrell approaches Vidrine to address the situation, he is whisked away by BP executives, who wish to present him with a safety award in front of the entire crew. However, Vidrine conducts another pressure test, which initially seems fine due to blocked pipes with rock particles, leading him to demand the well to be opened prematurely, against all sound judgment.
Initially, everything seems to be running smoothly, but the fragile foundation soon collapses, resulting in a cataclysmic blowout that risks the lives of the entire crew. A series of equipment failures and a botched attempt to seal the well result in a catastrophic ignition of oil, claiming the lives of 11 brave workers. Andrea Fleytas (Gina Rodriguez), the rig’s navigation officer, desperately tries to inform the Coast Guard, but her supervisor dismisses her concerns, adamant that there is no immediate danger.
With oil rapidly spilling into the ocean, chaos unfolds as an agitated pelican collides with the bridge of a nearby vessel, which then rushes towards the rig just as the crew faces a desperate evacuation. Despite being gravely injured, Harrell fights to regain control of the tumultuous situation alongside Mike, who saves him while realizing the rig’s fate is sealed. As the ordeal escalates, Dale Burkeen (played by Jason Kirkpatrick), a close friend of Mike’s, sacrifices his life to prevent the burning crane from collapsing on the remaining crew. Just then, Mike and Caleb manage to secure Vidrine and bring him to safety.
In a tragically tense moment, the crew hesitates to activate the pipe-cutting valve that would seal the well, feeling they lack the authority to act. By the time Harrell reaches the bridge to handle the switch, it is far too late, and the inferno continues to rage uncontrollably. As darkness envelops the surroundings, the Coast Guard finally recognizes the disaster and dispatches a vessel to rescue the survivors.
With lifeboats filled to capacity, Mike discovers an emergency life raft, but it becomes dislodged from the rig before he and Andrea can climb aboard. Just as the oil ignites and obliterates the rig, they leap into the water, managing to signal for help and are eventually rescued.
The situation grows dire as the rig loses power, and its engines fail, leading to the pipes tilting and tearing apart the blowout preventer on the ocean floor. The consequences are dire, with a staggering 210 million gallons of crude oil unleashed into the Gulf of Mexico.
After the harrowing event, the workers reunite with their families at a hotel lobby. Here, a heart-wrenching confrontation occurs when a relative of one of the deceased chastises Mike for not saving their loved one, triggering a panic attack as his wife offers support. The film culminates with a poignant montage of the aftermath of the disaster, showcasing real-life testimonials from Mike Williams, revealing a distressing truth: no employee of either Transocean or BP faced prosecution for their roles in this catastrophic event.
