I am thinking of a sea anchor you can control remotely, like a bucket with a bottom that would open/close when you push a button from your remote control.
You let the sea anchor, open, trail behind you as you build up speed, then you close it and the drag should pull you up as if you were on a kite. Once you reached the end of your rope, you would open the sea anchor, yank it out of the water, and glide down, then do it again.