Recovery efforts are continuing at the Nippon Dynawave Packaging, where a tank holding hundreds of thousands of gallons of a caustic chemical ruptured. Crews recovered six bodies from a Longview paper mill Thursday as they continued the response to a massive chemical tank rupture earlier this week. That brings the confirmed death toll from the Tuesday disaster to eight. Three more people remain unaccounted, and are presumed dead. The fatal release of a highly caustic liquid is Washington state’s deadliest workplace tragedy in 96 years. Here’s some of what we know about the disaster and ongoing recovery efforts. The death toll is likely to climb. …Recovery crews are navigating a challenging scene. …The danger appears contained — mostly, but tens of thousands of gallons of the caustic chemical known as white liquor escaped. Some reached a storm drain system that flows to the Columbia River. …The paper mill is shut down for now.