BlueFox
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“Inside the room it's silent. So silent that the background noise measured is actually negative decibels, -9.4 dBA. Steven Orfield, the lab's founder, told Hearing Aid Know: “We challenge people to sit in the chamber in the dark – one person stayed in there for 45 minutes.”
https://www.smithsonianmag.com/smar...will-drive-you-crazy-in-45-minutes-180948160/
https://www.smithsonianmag.com/smar...will-drive-you-crazy-in-45-minutes-180948160/