Thanks everyone! I'll definitely need some help with testing before I release anything to the wider public. You never know.
UNDERWATER SATCHEL CHARGES: Today, after smacking my head against the wall a few times and making dumb mistakes everywhere it seems, I've added the ability to position a satchel charge (it starts out attached to your body in front of you), release it at any depth where it will stay, arm the satchel remotely and add time to the satchel in 30 second increments. I will probably add the ability to add 1 min, 10 min and 1 hour time increments as well, but for now it's just adding 30 seconds at a time.
The only problem is attaching the satchel realistically to a target. I.e. if you attach the satchel to the back of a boat and the boat floats away, then you are SOL. I know there are existing mods out there I could look at for info on how to attach a satchel to a vehicle, but I think I need to hold off on that until I can concentrate on a few other things first.
GAS CONSUMPTION: I found some info online with statistics on normal and high exertion gas consumption. So I think I'll be able to make the dive computer a little more accurate looking once I've had a moment to digest how I'll implement the new data.
SOUNDS: I told myself I wouldn't make any videos until I got some sounds in game, but I anticipate some long nights with adding sounds to what I've already done. I.e. I will need to play a looping underwater breathing sound that will stop once I surface. Found a nice set of OFP instructions
that will help as long as the info is still current in the Arma2: OA world.
MOVIE: I'm thinking about making a short demo movie as it would be a fun break from #START; _a = _a +1; go "START"; amount of code writing.