Officials can also confirm there are 9 employees who remain unaccounted for. The vat - on a paper mill operated by Nippon Dynawave Packaging - contained "white liquor," a chemical combination of sodium hydroxide, sodium sulfide, and disodium carbonate. Officials initially reported the vat held 80,000 gallons of the deadly chemical, but officials later confirmed it actually held more than ten times that amount. Around 90,000 gallons remain inside the tank, which remains unstable - hindering search and rescue operations for the missing workers, officials said in a Tuesday evening press conference.