Volunteers who spent 40 days in cave for isolation study back above ground

Members of the French team that participated in the Deep Time study , emerge from the Lombrives Cave (Renata Brito/AP)

Fifteen people have emerged from a French cave after spending 40 days in voluntary isolation with no sense of time or date.

The eight men and seven women who took part in a scientific experiment emerged from their self-segregation in the Pyrenees on Saturday morning.