Published on January 17th, 20140
Where can you hear the longest echo? (AUDIO)
A network of tunnels that served as fuel depot, located in Scotland, dating from the time of the Second World War, is now the place where you can hear the longest echo. A gun shot noise can still be heard after nearly 2 minutes.
Specifically, 112 seconds - this is how long it takes for certain sounds that can be heard echoing in the Inchindown fuel depot.
The previous record was held by Hamilton Mausoleum, located also in Scotland, where the noise of slamming doors can be heard for 15 sec.
Unusual properties of the network of tunnels from Inchindown were tested by Trevor Cox, Professor of Acoustic Engineering at Salford University and author of Sonic Wonderland: A Scientific Odyssey of Sound. The record was certified by the Guinness World Records organization.
Consisting of tanks dug into the rock between 1939 and 1941, the deposit was intended to shelter in a safe place, away from the danger of bombs, 25.5 million liters of fuel for warships.
The warehouse has no doors (so that Professor Cox had to get inside through a pipe) walls are 45 cm thick, and the interior is approx. 200 m long, 9 m wide and 13.5 meters high.
With archaeologist Allan Kilpatrick (who shot a gun for acoustic specialist to measure the length of time the sound is heard), Prof. Cox measured the duration of the echo and understood immediately that it was a new record.
At 125 Hz (frequency sound of a tuba) sound reverberation lasts 112 seconds. Even at 30 Hz, in the frequency range relevant to human speech, reverberation take 30 seconds.
Considering all frequencies simultaneously the echo’s duration was 75 seconds, being the amount approved as a new Guinness World Record.
Seduced by the exceptional acoustics of this place, Professor Cox has even suggested creating special musical compositions to highlight the unique qualities of this building.
Source: The Independent