Unidentified Sounds

Ocean the final frontier?

 

http://www.timesonline.co.uk/tol/comment/columnists/guest_contributors/article4425859.ece

http://asia.cnn.com/2002/TECH/science/06/13/bloop/index.html

 

Here is a NOAA page with a collection of the biological sounds mentioned in the above article(s).  The "undersea roar" could be from a vent but it doesn't fit the profile.  Essentially these don't fit the categories as they are defined for known undersea sounds.  What could they be?

 

http://www.pmel.noaa.gov/vents/acoustics/sounds_mystery.html