Winged machines are "flying" – or at least swimming – beneath the waters of the Faroe Islands in the North Atlantic.
Known as "sea dragons" or "tidal kites", they look like aircraft, but are in fact high-tech tidal turbines, generating electricity from the power of the ocean.
So, how does the technology work?
This video is from BBC Click, the BBC’s flagship technology programme.
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L'informazione della testata giornalistica di LA7 diretta da Enrico Mentana