Here is a mathematical breakdown of the longest recorded reverb every recorded. A gunshot was recorded inside a fuel storage tank by Professor Cox in Scotland to shatter the record. The reverb lasted for 75 seconds.

The fuel storage facility shown to the right, and a mini photo tour are available at this BBC article.

‘I wanted to shout with astonishment, but I had to remain silent so as not to ruin the recording.’
–From Daily Post Interview

Here is a booming and thundersous sample  of the sound that could become your cellphone text message ring. Hit play and continue reading.
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