| (unrelated) Has anyone heard about Seaglider / C-glider? - Riding - FOIL.zone
| https://www.youtube.com/watch?v=sXpPyWx7JoQ
| https://www.youtube.com/watch?v=6uNWkd8nYHY
Design and Testing of a Scale-Model Surface Undersea Kite
I think good search terms might be hydrokinetic energy harvesting and tethered undersea kites (TUSK)