Inside The Quietest Place On Earth

Microsoft build anechoic chamber at its Redmond headquarters . The specialty of the room is that background noise level inside that room is -20.6 dB . Normal breathing produces 10dB sound. The room is so quiet , you can hear your blood flow.
Six concrete rooms within rooms that enclose the chamber. They can reduce the noise of a jet taking off to a whisper.
Inside the room you can also hear the noise produced by colliding air molecules that is -24 dB. It is the theoretical limit of quietness outside a vacuum.

It was build in 2015 . The year it was made it also made a world record beating the -9.4 dB mark of Orfield Laborities in Minneapolis. In above mentioned (Orfield Lab.) room a man survived only for 9 seconds and then died due to the noise produced by his blood flow.