Secret Life Underground - Episode Guide

We know less than 10% of the organisms that populate the underground world and that, each in their own way, take an active part in creating the soil. We are just beginning to discover that plants form partnerships and create complex unions. Welcome to this subtle, surprising and secret world.

Take a journey alongside scientists into an underground maze with huge surprises in store. They lead us into monumental cavities, shaped by water and by time. They reveal to us mineral jewels of staggering beauty, and shed light on certain species of fauna that defy the imagination.