User blog comment:First $ea Lord Sven Daggerteel/Something in store for us in 2012?/@comment-3242795-20120717220838/@comment-3242795-20120717222252

Okay, you obviously don't understand what splicing is. First off, the whale moans can be heard for MILES! Second off, splicing is taking something, cutting it up, and layering it over something else to create a collage. In this case, they recorded whales moaning, cut it so that the moans are on their own, without background noise, and they place it over the original audio file so it plays both the original, plain audio with the "mysterious sounds," over it.

Even if it isn't spliced, which I'm 99% sure it is, it could also be just the WIND!