I'm currently on Eleuthera (Bahamas) and going to a good shark dive site soon. I have been there once before, I didn't bring my camera. The water is very clear and the reef sharks slowly swim around you.
I have a Nikon P7700 (compact camera, about 4 years since it came out) with an Ikelite housing and one ds-50 strobe with TTL functionality. I also have the attachment to adjust strobe power manually but this precludes use of TTL. I have done a lot of snorkeling practicing with the camera. I have been using TTL mode with mostly good results. I have barely practiced with manual strobe settings.
Is TTL OK for shark photography? What strategy do you recommend for shark photos?