In March 2021, explorer-researcher Christian Clot, along with 14 volunteers (7 women and 7 men), embarked on an unprecedented scientific expedition by isolating themselves for 40 days in the Lombrives cave in southern France. Devoid of natural light and any time indicators, the group aimed to study human adaptability and the brain's perception of time in a timeless environment. This documentary captures their journey, exploring how individuals and the group as a whole synchronize and function without temporal references.