It has been described as the "greatest untapped source of energy Scotland has ever had", capable of generating enough electricity for every home and business in the country several times over.
But while the Pentland Firth has been too deep and too dangerous to exploit, the race is now on to develop machines that will harness this "underwater hurricane" and fundamentally change Scotland.
Not only could it provide endless supplies of electricity for Scotland and beyond, but spare energy could be used to convert rubbish into environmentally friendly biofuel for cars, trains and airplanes, slashing greenhouse gas emissions and ridding the
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