I was also wondering this, you beat me to asking. If there is precedent for two cables why not connect them to make a long narrow loop of them like on a ski-lift; place an electric-powered winch on one end and an idler on the other?
Was neat to see the video, and I’m sure they have their reasons.
One reason may be that the cable sinks to the ground, which makes it possible for other boats to cross. If it was like a ski lift, the cable had to be more tensioned I guess, thus obstructing?
Was neat to see the video, and I’m sure they have their reasons.