‘This cave system is a mile in length, nearly 400 metres deep, and it perforates an entire mountain from one side to another,’ says Lucian. ‘The free movement of wind along the cave system, combined with the chill of the rock itself, keeps the temperatures within the system well below freezing. Snow gathers in the cave mouths in the winter, blown deep into it by the northerly winds, and – hey presto! – over thousands of years, the snow becomes a long thin glacier, winding within the mountain.’
