Hi Bob,
Welcome to ScubaBoard!
I'm glad to see the interest you've sparked in this thread with your idea for starting a new show about diving.
Hopefully, the investors see the potential from this target audience.
It would be nice if during each 42 min. episode you could have a variety of information presented. This would keep it moving at a fast pace for today's non-diving viewers who get bored quickly. It would also appeal to a wider demographic.
You could start with a segment on something that would appeal to the recreational crowd with lots of clear water and pretty fishes. As a a short middle segment you could include something teaching people a bit more about the science behind diving that would also help get educators on board by recommending your show to their classes. End it with a segment that would interest the technical diving crowd, but still appeal to the recreational crowd involving wrecks, caves, ice diving, etc. This would be more of an "adventure diving" segment, which would probably appeal to non-divers enjoying this activity vicariously. Ending on the adventure note would leave them wanting more and looking forward to the next episode.
I'm thinking along the lines of a modern version of the old Jaques Cousteau specials. Of course, most of today's shows about diving wind up looking like Huell Howser style home videos. So it would really be nice if this could all be done with a set of high production values and using a decent DP, but I know that it can be really expensive to go that route to start.
Those are just some random thoughts off the top of my head.
Good luck!
Christian