The anechoic chamber at Orfield Laboratories holds the current Guinness World Record as the quietest place on the planet, and can absorb almost 99.99% of all sound waves incident on its carefully crafted walls.
See this video:
With all outside noise shut out, test subjects who spent time inside the chamber, started hearing the sounds of their own organs(e.g. their heart, lungs, stomach etc.) functioning, at volumes slightly louder than what they would've preferred. Staying in for long enough, caused them to lose their hold on things and hallucinate. The longest anyone has ever lasted in there is 45 minutes!
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