Squeezed between South East Asia’s two most formidable geographical barriers - the Annamite mountains and the Mekong river, lies Khammouane – a rugged karst landscape, honeycombed with countless caves. These caves were formed by water flowing down towards the Mekong. Unlike life above ground that is subject to continual change - the different seasons or day and night, cave environments are constant. It’s a world of total darkness, stable temperatures and high humidity. Many creatures retreated into the caves millennia ago and now are perfectly adapted to this environment.