Woman Found Dead Inside Freezing Cryochamber Experts recommend three minutes; she may have been in the machine for 10 hours By Michael Harthorne, Newser Staff Posted Oct 24, 2015 4:12 PM CDT 76 comments Comments A cryotherapy session in Tennessee. A 24-year-old woman was found dead in Nevada after spending at least 10 hours inside an extremely cold cryochamber. (Jessica Tezak/Knoxville News Sentinel, via AP) (Newser) – Authorities say a 24-year-old woman found dead a Nevada spa earlier this week had spent at least 10 hours inside a cryochamber—a machine designed to expose users to temperatures as low as negative-240 degrees, KSNV reports. According to experts, no one should spend more than three minutes in one. Chelsea Ake, the manager of the Rejuvenice spa, was closing up by herself when she got into the machine and didn't turn it off, her friend Shae-Lynn Bee tells KSNV. "There are no cameras in there,” she says. “Basically, the only person that does know what happened is Chelsea." Police are blaming "operator error," and say Ake may have suffocated. Her family says she froze to death inside the cryochamber. The machines are meant to expose users to extremely cold air as a substitute for cold water immersion or ice packs.