On June 9, 2016, halon gas was accidentally emitted because of malfunction of fire extinguishing equipment in . The following is the sequence of events leading up to the malfunction. An air conditioner drain pipe had clogged, and water leaked. The water had accumulated in a structural. Because the spray of water from the structural entered into a fire extinguishing equipment activation box, short circuit had occurred, and emission signal had turned on, which caused of the trouble.