It is located in the center of Vienna, and yet it still contains secrets that pose a great mystery to the researchers. The Michaelergruft is one of the few tombs in the world where the dead were preserved as mummies in their coffins by a unique process. ServusTV exclusively accompanies an excavation under the St. Michael Church. The scientists want to open a crypt that has been closed for more than three hundred years. Only in this way can they gain unique insights into the life and death of our ancestors.