However, the project was not without controversy, and the safety facilities which were under construction from 1906 to 1915 were never completed in their entirety and, in some cases, even dismantled again.
Allerdings war das Vorhaben nicht unumstritten und die Sicherungsanlagen, an denen man von 1906 bis 1915 arbeitete, wurden nie in Gänze fertiggestellt, ja teilweise sogar wieder zurückgebaut.