EST on March 4, 1985. Heavy, wet snow accumulated on the southwest corner of the dome and depressed the fabric panels low enough so that the fabric came in contact with a steel lighting catwalk that was positioned just below the inner lip of the roof's ring beam. The hole caused a loss of air pressure and the Dome deflated slowly – there were no injuries. The shift from a "dome" to "bowl" caused all the heavy, wet snow to slide down into the bowl and rupture more roof panels, collapse some precast risers in the SW upper deck, and dislodge more plastic seats "... than a Rolling Stones concert" according to Bob Haney, the Dome's Operations Manager. Crews from Owens-Corning Fiberglas, the dome's original roof installer, were on site by 1:30 pm on March 4. Repair operations began immediately but were interrupted for over a week due to high winds. During the high winds event nearly all of the remaining panels in the deflated roof, 100 in all, were badly damaged. The decision was made to replace the entire roof and incorporate some improvements to prevent a similar event from occurring in the future. Repair cost of the roof was just under $8 million. The repairs were completed and the dome re-inflated at noon on May 28, 1985. A thunderstorm passed through the Pontiac area the morning the Dome was to be re-inflated and a partial inflation, or "puff", was performed so that the scheduled inflation could occur in the presence of the many city and area politicians as well as a number of corporate executives. The original-style, Teflon-coated fiberglass material was used to make the repairs – not canvas as described in the article. There were several snow-melting and waterproofing improvements that kept the dome inflated until January 2, 2013 – almost 28 years. Notable audience attendance numbers The largest crowd to gather at the Silverdome was on September 18, 1987, for Mass with Pope John Paul II, with a reported attendance of 93,682 — just shading the reported record of 93,173 set at the Silverdome on March 29, 1987, for WrestleMania III. Another notable audience attendance record had earlier been broken on April 30, 1977, when the English rock band Led Zeppelin played in front of 76,229 fans at the Silverdome. This was, at the time, a new world record attendance for a solo indoor attraction, beating