A very popular videogame character, which is famous for his sonic speed, is depicted breathing underwater by using air bubbles. Now since I've never heard anyone complaining about this, despite the large amount of people I see complaining about the lack of reality in fiction media, I assume many of them believe it's possible. I hope that's enough to constitute a popular claim by omission.
Anyway, considering the air flowing at the bottom of a swimming pool is the same as the ground atmosphere's, is it possible for a human, not a hedgehog, to breath in it?
It's been discussed in the Mythbusters forum.
Animals reportedly breathing underwater with air bubbles.