Emmerdale star Amy Walsh has described shooting the factory fire scenes as "hardcore" ahead of tonight's dramatic developments (August 1).
Thursday's episodes will see one person lose their life after the factory catches on fire. Tracy Metcalfe, played by Walsh, is in the most immediate danger as she finds herself trapped in a storeroom at the worst possible time.
A first look clip shows Tracy fearing for her life when smoke starts to pour into the room.
Related: Emmerdale: Shock fire drama revealed in 21 new spoiler pictures
Walsh shared that filming Tracy's ordeal was rough, and likened the experience to being on a hot London Underground.
"You're trapped in a studio with smoke for two days. It was like being on the Underground. It was hardcore," she said (via The Mirror).
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"Putting your body through that craziness is hard work.
"It's just been a really sad, emotional storyline because you know someone's going at the end of it."
The fire is unwittingly started by Amy (Natalie Ann Jamieson) and Kerry Wyatt (Laura Norton), after they sabotaged the CCTV to cover their tracks regarding the stolen money in the safe.
But Rishi Sharma (Bhasker Patel) could be initially blamed for the fire, with the business in a dire financial situation.
Emmerdale airs weeknights at 7pm on ITV, with extra episodes at 8pm on Tuesdays and Thursdays.
Read more news, spoilers and gossip on our Emmerdale homepage
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