[geopyg]

I recall a Discovery show where they were touring some gov't. oceanographic place. They used the old sonar listening stations to listen to sea life. The science guy that monitors the system was running through the some of the recordings and saying "that's a humpback in the North Pacific, etc. He then played this really weird sound (although the whale sounds weird too) that he said "We have NO idea what the heck that is. It's coming from the deepest part of the Antarctic trench (or some equally obscure place). I LOVE the mysteries of the earth! And even the croaking of some types of frogs can freak a person out depending on the situation!

[AnnaZ]

He then played this really weird sound (although the whale sounds weird too) that he said "We have NO idea what the heck that is. It's coming from the deepest part of the Antarctic trench (or some equally obscure place).

Was it Bloop?