An interesting discovery about the dive plane that I didn’t mention is that you can fly with the board radically “canted.” I learned this when putting the go-pro on the corner of the board. At first I put it facing forward, and then 90* to the side. But I learned that I could mount the camera 45* to the right, and still fly straight forward to film ahead, or fly film to the right, and still fly ahead, or roll, etc.
What I’m trying to say is the board with the near-center pulling point is fully controllable even when warping or canting 45% (or more) right and left. This would not be possible with the Subwing or other multiple-line boards.
I saw an old video of the diver who directed the underwater scenes in “Thunderball” and “Never Say Never Again”. He said the underwater filming and the devices, many of which had to be invented, was extremely difficult.
He also was the monster in “Creature From the Black Lagoon”. He is my BIL’s cousin, they both grew up in Jensen Beach. His name is Ricou Browning.
It made me realize that all that underwater stuff is a bit harder than it looks like.