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Limits RegistryMicrosoft's anechoic chamber at its Redmond, Washington campus recorded a background noise level of -20.35 dBA in 2015, certified by Guinness World Records as the quietest place on Earth — so quiet that visitors report being able to hear their own heartbeat and blood flow, and most people cannot tolerate more than about 45 minutes inside before becoming disoriented.
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Microsoft's anechoic chamber at its Redmond, Washington campus recorded a background noise level of -20.35 dBA in 2015, certified by Guinness World Records as the quietest place on Earth — so quiet that visitors report being able to hear their own heartbeat and blood flow, and most people cannot tolerate more than about 45 minutes inside before becoming disoriented.
The lowest background noise floor ever measured inside a purpose-built anechoic (echo-free) chamber, as certified by Guinness World Records.
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Permanent ID limitsregistry.com/limits/LR-QUIETEST-ANECHOIC-CHAMBER
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Limits Registry. LR-QUIETEST-ANECHOIC-CHAMBER. Quietest human-made room ever measured. 2026.