Between the 1980s and the 2000s, parts of the top slab of the arch collapsed, significantly widening the arch. A large slab of rock on the outer edge of the cavity collapsed in April 2012, further increasing the size of the window. Another rock fall occurred in March 2013. Four months later a geological and geotechnical report was prepared by consultant Peter Gatt, who represented local firm Geoscience Consulting Ltd, and it determined that the arch was "relatively stable and will continue to remain so for a number of years", and that there was no "imminent" risk of collapse, although it warned that rock falls will continue and it might be hazardous for people to go close to the arch.
