In December 1994, an archaeological marvel hidden deep inside France's Gorges de l'Ardèche was revealed to the modern world for the very first time: the Chauvet cave. Scientists immediately recognised the importance of this discovery. Sealed by a landslide more than 20,000 years ago, the cave had been extraordinarily well preserved. With over 1,000 paintings adorning its walls, Chauvet is a cave art jewel. How were the hidden chambers first formed? Who created the extraordinary art? And how can we preserve it for future generations? Follows a 30-year archaeological, geological and artistic adventure as scientists endeavour to understand and conserve this exceptional record of humanity's distant past.