On Friday, August 24, 2007, construction crews discovered a seven-meter (23 foot) long fissure in the ceiling of an underground corridor linking the McGill station to The Bay store located under de Maisonneuve Boulevard, between Aylmer Street and Union Avenue. The station, the Underground City shops, and above ground streets and buildings were closed to assess whether there was any risk of collapse of the structure. Service on the Métro Green Line was halted between Berri-UQAM and Lionel-Groulx stations until Sunday evening. According to a spokesperson for the Hudson's Bay Company, city workers may have caused the damage by hitting a nearby pillar.