I'm continuing to work on getting a good motion blur underwater. This frame is subdued ambient light only.

I'm still hobbled by Canon's refusal to allow rear shutter curtain sync on at least four generations of digital Pro bodies for any strobes but their own Speedlights. That excludes studio strobes the world over.... and, of course, underwater strobes.

The idea is to have a very light kiss of strobe light, maybe on the face, at the end of the blur (2nd curtain time), not at the beginning (first curtain time).