Orfield anechoic chamber

Orfield anechoic chamber - the quietest place on Earth | News | Geek.com

Imagine darkness and utter silence surrounding you; the only thing you can hear is the pulse of your own heartbeat. This description isn't of outer space, this is Orfield Laboratories acoustic sound

http://www.geek.com/news/orfield-anechoic-chamber-the-quietest-place-on-earth-1483113/