I caught an episode of this on thistv. I was intrigued as it was an old show I'd never heard of and came on before Flipper. That's some programming there talk about a one two punch. Seriously, how much did they pay for each of those shows a dollar?
Well, it wasn't bad but it did have a fatal flaw. Sea Hunt man , who's name is Mike Nelson of all things.doesn't have a partner. When he's doing something he's breathing into his oxygen thing so they have to have him narrate. Well, that means there's not much dialogue for one and also it's done in the past tense so you know whatever the danger is that he's made it through and you're reminded of that every time he talks. That's how it was in the one episode I saw anyway.
If you are a fan of the original Sea Lab cartoon check it out. it's similarly "rare" (for a reason) and has lots of scuba equipment.