List of unexplained sounds
- Bloop http://en.wikipedia.org/wiki/Bloop
- Colossi of Memnon http://en.wikipedia.org/wiki/Colossi_of_Memnon#Sounds
- Julia http://www.pmel.noaa.gov/vents/acoustics/sounds/julia.html
- Quacker http://en.wikipedia.org/wiki/Quacker_(sound)
- Slow Down http://en.wikipedia.org/wiki/Slow_Down_(unidentified_sound)
- Upsweep http://en.wikipedia.org/wiki/List_of_unexplained_sounds
- Hums http://en.wikipedia.org/wiki/The_Hum
- The Train http://www.pmel.noaa.gov/vents/acoustics/sounds/train.html
Listen to some at them at YouTube: http://www.youtube.com/watch?v=nkU20kz2jxc
