Some ocean Discovery channel type show briefly talked about the sound monitoring system and the guy was playing tapes of whales, etc.
He played one that was distinctly different than the other ones - sounded almost electrical or "alien" like - much weirder than the others. He said we have NO idea what this is - and said it comes from some remote area (Middle of the Indian Ocean?).
Obviously this Whale belongs to an endangered species and we should not allow any ships to sail in the Ocean for fear this whale might be injured.
Cool story! (I love stuff like this).