Kite for low currents?

According to Sweden’s Minesto, the Holy Grail of extracting usable power from tidal arrays in low current locations could lie in ‘flying’ what appear to be underwater kites.

Minesto’s tidal power plant, called Deep Green, looks like an underwater kite

According to Sweden’s Minesto, the Holy Grail of extracting usable power from tidal arrays in low current locations could lie in ‘flying’ what appear to be underwater kites.