Mystery life of tunnelling animals revealed in documentary A new BBC documentary is hoping to lift the lid on the subterranean life of rabbits, badgers and water voles. The Burrowers has used specially built full-scale replicas of the animals' habitats, and cameras have followed their every move. Jeremy Cooke reports. The Burrowers: Animals Underground is on Friday 16 August at 2100BST on BBC Two How to identify burrowing mammal holes Searching for nature's tunnellers