▁ 1 1 ▁April ▁ 1 9 9 7 , ▁the ▁Tur in ▁C athedral ▁sust ained ▁another ▁fire , ▁but ▁the ▁S hr oud ▁surv ived ▁entirely ▁un sc athed . ▁By ▁that ▁time ▁the ▁S hr oud ▁stayed ▁within ▁the ▁three ▁walls ▁of ▁plate ▁glass ▁each ▁ ▁long ▁and ▁ ▁high . ▁The ▁fire man ▁Mario ▁T rem atore ▁decided ▁to ▁use ▁a ▁s ledge ham mer ▁against ▁the ▁bullet proof ▁glass ▁to ▁rescue ▁the ▁re lic . ▁Event ually ▁he ▁caused ▁the ▁ 3 9 mm ▁thick ▁material ▁to ▁sh atter ▁and ▁another ▁fire man ▁arrived ▁to ▁help ▁T rem atore . ▁When ▁asked ▁how ▁he ▁managed ▁to ▁break ▁the ▁glass , ▁T rem atore ▁replied : ▁" The ▁bullet proof ▁glass ▁can ▁stop ▁bul lets , ▁but ▁it ▁cannot ▁stop ▁the ▁strength ▁of ▁values ▁represented ▁by ▁the ▁symbol ▁inside ▁it . ▁With ▁only ▁a ▁ham mer ▁and ▁our ▁hands ▁( st ill ▁ble eding ), ▁we ▁broke ▁the ▁glass ". ▁ ▁During ▁the ▁ 2 0 0 2 ▁rest oration , ▁conducted ▁by ▁the ▁Commission ▁for ▁the ▁Conserv ation ▁of ▁the ▁S hr oud ▁between ▁ 2 0 ▁June ▁and ▁ 2 2 ▁July , ▁thirty ▁tri angular ▁patch es , ▁se wn ▁by ▁n uns ▁in ▁ 1 5 3 4 , ▁as ▁well ▁as ▁the ▁Holland ▁cloth , ▁were ▁removed . ▁The ▁pre - 1 5 1 6 / pre - 1 1 9 2 ▁L - sh aped ▁burn ▁holes , ▁called ▁" p oker ▁holes