So clear that it looks faked. For those who have never been there, the water coming out of the spring stays right around 70 degrees year round. That doesn't sound too cold until you're in it and can't catch your breath.
I just realized that I think they put this pic wrong side up. Shouldn't the bubbles be going toward the surface? And the light should be coming from above, not below. So I twisted it, and now I think it is correct.