This thesis examines the inner workings of a group of researchers collaborating on an archeological excavation in Ormesson (Seine-et-Marne, France), on a paleolithic site strewn with thousands of flint pieces and bone fragments. Every year, around twenty people from various backgrounds share the day-to-day experience of working on the exploration of the site, as they live together for more than a month. I argue that the roles distributed by the site manager who organizes the operation are only the porous boundaries of each digger’s real, variable, fragile engagement. By developing a methodological protocol that involves participant observation and the filming of entire days of work, I dissect this closed scientific world through the way in ...