The client, in her early thirties, was admitted to hospital in a critical condition after the accident late Monday claimed the life of an employee in her late twenties.
An autopsy on the first victim showed she suffocated due to a lack of oxygen, it added, which might confirm the theory of a nitrogen leak into the cryotherapy chamber.
Nitrogen is a colourless, odourless gas. It makes up around 80 percent of the air we breathe, while oxygen accounts for 20 percent.
Advocates say whole-body cryotherapy is effective in reducing muscle soreness, stress, rheumatism and various skin conditions -- like ice baths.
Cryotherapy sessions came under scrutiny in the United States in 2015 after a woman froze to death at a Las Vegas spa.
The 24-year-old woman was believed to have entered one of the spa's cold chambers after business hours to relieve some aches, and was discovered the next day by a co-worker.
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