One problem with filming long scuba diving swimming scenes realistically is the lack of communications between the divers or between the divers and the crew on the boat. This can be overcome by full face masks with communication. Otherwise, the underwater scenes will need to be narrated. Wait. Hold on. Let's cut over to a movie being shown at a theater already in progress.
The diver has just arrived at his first decompression stop after making a slow ascent. Wait. Wait for it. He.......He's.......He's, checking his dive computer. Zzzzzzzzzz. It appears the diver is........is........is doing absolutely NOTHING. Zzzzzzzzz. Zzzzzzzzz.
After the movie some of the viewers were being interviewed. Sir, what did you think of the movie? "It was great! I loved it! I got the best sleep I've had in weeks. Is there going to be a sequel?"
Too much realism in a scuba diving movie is going to make viewing bingo seem like an action-packed thriller. There is one category where watching a movie of diving will be exciting. It's a movie of yourself being filmed by your buddy. Through the movie you can relive the experience. It's value to other viewers is questionable however. I've seen enough videos on SB and youtube to be convinced that unless there is some educational value in it for me, after 10 minutes I'm ready to move on.
The excitement in scuba diving is in the personal experience and not in the viewing of it.
