By 1960 it was obvious from the deteriorating condition of the tombs that the environment of changing heat and humidity needed to be controlled if the historic sarcophagi were to survive for future generations. The New Vault, north of the Tuscan, Ferdinand's and the Franz Joseph Vault, was built by architect Karl Schwanzer, with metal doors by sculptor Rudolf Hoflehner. It added about 20% to the space of the crypt, and was used as part of a massive rearrangement of the tombs in the vaults.