The World Record of ‘longest eco sound’ has been achieved by Inchindown Tunnels from Invergordon, Scotland, UK.

In the oil tank dug into the hillside, acoustic scientists fired a pistol to hear how long the reverb would last. The resulting echo rang on and on and on for One minute and 52 seconds. The tank has walls 17.7 inches (45 cm) thick. The space is about 30 feet (9 meters) wide and 44 feet (13.5 meters) high.

Previous World record:

The World Record of ‘longest eco sound’ has been achieved by Hamilton Mausoleum from Lanarkshire, UK. Here the echo rang for One minute and 37 seconds.