NOVASezóna 3 Přidat obrázekČíslo epizody13The Underground MovementOverviewNOVA explores life underground, from foxes and badgers through moles and worms down to the myriad of micro-organisms that make soil the most complex substrate for life on earth. Included in the film is extraordinary footage of a mole burrowing and of roots growing.Air dateApril 18, 1976Runtime (min)60