The quietest place on earth is here: http://www.dailymail.co.uk/sciencet...etest-place-chamber-Orfield-Laboratories.html This has a sound absorption of 99.9% could you ever get 100%?
Yeah, sound waves need a physical medium to travel through; that's why, in space, "no one can hear you scream"...
That room simply has no echos, nor reverb, (to 99.9% anyway). They test the sounds of washing machines and motorcycles in there, so it is nothing like a vacuum. In the recording industry they call it "dry".
In clarification, the OP asked if it was possible to get to 100%. There's no material which could ever absorb 100% of sound vibrations, but a vacuum would work.
I just thought it was worth noting that the room is not a place where sounds cannot be heard at all. The article is a little over-dramatic, and it seems to cause people to think that is the case. Someone in the comments under the article speculated that the sound waves in the room must be canceling each other out. But I am pretty sure if a live band set up in there, no one in the room would have any problem hearing the music.
