The preventive excavations which began after the fire which ravaged part of Notre-Dame de Paris in April 2019 made it possible to find ancient treasures and vestiges. This is the case of two lead sarcophagi exhumed by archaeologists at the crossroads of the transept, between the nave and the choir of the cathedral, which have yielded important secrets. The details with Christophe Besnier, scientific manager at the National Institute for Preventive Archaeological Research.