Goofs

In reality, the diver was resuscitated underwater on top of the platform. His fellow diver routed air to his suit, which is when he began breathing. He then climbed back up to the platform himself.

The characters in the pressure chambers speak normally despite breathing helium, which should make their voices high-pitched. This is likely a creative choice for clarity and drama, possibly justified in the film by voice-normalizing tech, as actor Finn Cole hinted in a Mochi Magazine article (Feb 28, 2025). Online discussions, like a Reddit thread (Dec 12, 2024), note the contrast with the real helium voices in the 2019 documentary, suggesting the filmmakers prioritized storytelling over strict realism.

Chris told his fiancé what happened during his phone call with his wife. He did not want her to hear about it on the news.

A few times in the movie the error is made in referring to Chris's breathing gas as oxygen. He is using a Heliox mix (combination of helium and oxygen). Pure (100%) Oxygen becomes a neurotoxin if used beyond its Maximum Operating Depth (MOD) of 20feet.

The film names the ship as the Tharos. In the real event the DSV involved was the Bibby Topaz.

Notable that the MV Tharos was a semi-sub support vessel in the North Sea that was assigned to the Piper Alpha. It was utilized in recovery and firefighting operations during the 1988 disaster.

Saturation divers breathe a mixture of oxygen and helium, known as heliox. This mixture makes the diver's voices sound high-pitched, like a cartoon character.