Wavy, Undulating, Swirling, Muffled, Muted
This collection, sometimes, literally sounds like it's under water - perhaps like whale song, or its alien counterpart. I would use these Atmospheres in scenes, well - where one might find themselves under water. I know, it's kind of obvious, but there's little more to say about this simple collection. Then again, it could be sound emanating from space, even though we all know that in the vacuum of space, there is no sound.