 Soay has a primitive hut known as Taigh Dugan ( Dugan 's house ) . This is little more than an excavated hole under a huge stone with two rude walls on the sides . The story of its creation relates to two sheep @-@ stealing brothers from Lewis who came to St Kilda only to cause further trouble . Dugan was exiled to Soay , where he died ; the other , called Fearchar Mòr , was sent to Stac an Armin , where he found life so intolerable he cast himself into the sea . 
