Then the building housing the city's historical archive completely collapsed in March of 2009, killing two people. Huge quantities of invaluable historical documentation were also seriously damaged or destroyed in the incident, which was later determined to be the result of work on the nearby subway tunnel.
The subway project is set to be completed only in 2019. And for now, cathedral officials are insisting that there is no immediate danger to the structure. Provost Feldhoff said that visitors need not be worried. After all, the church has withstood greater vibrations that those currently being created by the subway, and not just during World War II. In March 2011, seismographs noted that the entire structure rose and fell by up to a centimeter several times. The cause was the massive earthquake in far-away Japan.