This fascinated me for lots of reasons.
1. Aren’t bubbles supposed to rise to the top of the water? (This gets brought up in the video, too.)
2. There must be some kind of movement to the rings, meaning there is a technique. That means that the dolphins are TEACHING each other skills that require some level of expertise.
2a. How did the first dolphin perfect the technique?
2b. Why did the first dolphin perfect the technique?
2c. How did the first dolphin train other dolphins?
2d. Why did the first dolphin train other dolphins?
2e. Could the dolphins teach ME to do that?
3. I wonder if they teach each other as to include others or if being able to make a bubble ring is a status symbol in the dolphin culture.
4. What about the rotation of the ring allows it to, seemingly, defy traditional fluid dynamics?
If anyone can answer ANY of these questions (especially 2e.), then add them to the comments.