Dolphin art?

[ame="http://www.youtube.com/watch?v=uIVk5rSsSq8"]YouTube - SeaWorld dolphins blowing and playing with bubbles[/ame]
 
I think the fact that it is a ring may slow its upward progression.

The dolphin manipulation of it is part of it two.

I love that they can make smaller rings out of the big ones.
 
How is that physically possible? Blowing a ring bubble that doesn't rise to the surface I mean.

The dolphins are manipulating the water like we would air. There is obviously a current around the air-ring.
 
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