In 2014, a test resulted in a reverberation that lasted 112 seconds

Inchindown: a former Royal Navy depot which has the longest echo in the world

There are abandoned sites that have fascinating features. One of the most amazing is found in the Scottish Highlands.

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In 1938, the British Royal Navy began construction of a large ship fuel depot at Invergordon, near the city's naval base. Officially named Inchindown Royal Navy Fuel Tanks, the bomb-proof, underground tank was completed in 1941 and consists of six tanks, five of which are 237 meters long, 9 meters wide and 13.5 meters high, and a sixth shorter tank.

One of the approaches to the Inchindown reservoir (Photo:

The tank remained in service until the Falklands War (1982), when it reached its maximum capacity, according to BBC. In 1988 a plan to upgrade this reservoir was scrapped and it was finally abandoned in 2002, after undergoing extensive cleaning. Outwardly, the deposit goes very unnoticed. The only clue that there is a huge deposit there are the accesses to it.

The Inchindown Reservoir was not made for human beings to access inside, so to get inside you have to go through one of these narrow pipes (Image: Tom Scott).

In January 2014, this ancient repository was the site of a curious test organized by Professor Trevor Cox, an acoustic engineer at the University of Salford, and by the Royal Commission on the Ancient and Historical Monuments of Scotland (RCAHMS): a gun was fired inside the tunnel and the reverberation of the sound lasted 112 seconds, setting a world record that until then had been held by the Hamilton Mausoleum in Lanarkshire since 1970.

In 2018, Tom Scott repeated that test , which we can see in this video:

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