I really should have taken a video of this, its hard to capture with photos how amazing this was.
These transients were all traveling right under the surface of the water, which was so clear we could clearly see the outlines of their bodies and white patches. They were in a tight cluster, tail slapping, breaching, and rolling over each other. I even heard a little vocalization at one point! It was really incredible, never seen anything like it. I feel very privileged to have witnessed this.