In the 1990s, the choir started to become very unstable. In some places, the pillars had moved more than 30cm. Due to the risk of collapse, immense trusses were urgently installed in 1993. Moreover, since 2000, scaffolding has been continually put up around the cathedral to overcome these problems. In 2010, another series of work including the restoration of the roof was started, a project that should last nine years. The causes of such instability are known these days thanks to extensive studies which have led to the solving of these problems and it was only when they were that the huge trusses that were urgently installed in 1993 could be taken down. According to several experts, Beauvais Cathedral has never been this stable and so grand visions of the long-term prospects of a new spire of a great height to be built above the cross of the transept resurface once more.