The Quietest Place on Earth - Orfield Labs

"Above all was the sense of hearing acute. I heard all things in the heaven and in the earth. I heard many things in hell." "The Tell-Tale Heart", Edgar Allen Poe

"He said they have an ongoing bet for a case of beer regarding the chamber. If someone can last 45 minutes in there by themselves with the lights off, then they get a case of beer. If I remember correctly no one has been able to make it past a half-hour yet.

Basically with such a lack of sound the body and mind start freaking out. Imagine your heart beat being the loudest thing in the room. He can go into much more detail than I, but I found that extremely interesting."

See also: http://en.wikipedia.org/wiki/Isolation_tank