Neil Oliver ventures out onto Worm's Head, a snake of land reaching out of the Gower Peninsula. Further up the coast he finds out about the quarrying heritage of Abereiddi and Porthgain. At Porth Oer Alice Roberts attempts to solve the riddle of the 'Singing Sands': what makes some very special British beaches whistle when you walk on them? Alice records the sounds of Porth Oer's beautiful beach to reveal its surprisingly musical secrets.