Experts say implosions of this kind are extremely rare – and do not happen by themselves. The KING 5 Investigators looked into what went wrong. LONGVIEW, Wash. — A massive industrial tank at the Nippon Dynawave Packaging paper mill partially imploded Tuesday, killing at least two workers and releasing hundreds of gallons of a caustic chemical capable of dissolving skin on contact. The facility uses the tanks to turn wood chips into paper products – a process that relies on powerful, highly corrosive chemicals kept under precise conditions. The tank held “white liquor,” a mixture of chemicals used to break…