Listen to the world’s longest echo

By Casey Frye, CCNN Writer

echo chamber
During the Falklands War in 1982, this tank and 5 others like it were filled with oil.

Trevor Cox, a professor of sound from the University of Salford, set the record for the world’s longest echo. How? By using a pistol inside of an old abandoned war fuel bunker in Scotland!

The bunker itself was designed to hold more than 6.7 million gallons of oil in a bomb-proof location for wartime machines.

It’s twice as long as a football field, about 30 feet wide, nearly 44 feet tall, and has walls that are close to 18 inches thick.

Cox shot a pistol inside the gigantic oil tank and the sound echoed on for 112 whole seconds. He explains, “…when we fired the pistol my initial reaction was disbelief; the reverberation times were just too long. I knew immediately we had a new world record.”

In fact, the sound length did set a Guinness World Record, but only 75 seconds qualified. That’s still many times longer than the 15-second record which previously held the title. “It would be interesting to write a piece of music to the pipes,” added Cox.

Images courtesy of the Royal Commission on the Ancient and Historical Monuments of Scotland.