Three years after the devastating fire at Notre-Dame Cathedral in Paris, archaeological excavations uncovered treasures that had been hidden beneath the building for centuries: In addition to numerous sculpture fragments, there were also two human-shaped lead coffins. Who are the dead in these sarcophagi? What did the sculptures represent and why are they buried under the church? By venturing into previously inaccessible areas of the Gothic sacred building, the archaeologists uncovered a forgotten part of its history. An interdisciplinary team of scientists is undertaking extensive work to uncover the secrets of Notre-Dame.