In February in the same year, when the work to prevent the fall-off of the ceiling was done in the space called "Toriaibu" between the stone chamber and the conservation facility, staff entered the chamber without any protective clothing.
同年2月、石室と保存施設との間の取合部（とりあいぶ）と呼ばれる部分の天井崩落防止作業を行った際、作業員が防護服を着用せずに入室した。