"With Operation Chimera, we are exploring a new fantasy: quarantine and biohazard. The two operators are biohazard specialists from France and Russia. During this first Season, our first major coop event, Outbreak, will take place over four weeks."
Official Website Description

Operation Chimera is the eighth expansion of Tom Clancy's Rainbow Six Siege. It adds two new Operators from Team Rainbow's newfound CBRN CTU and new cooperative game mode Outbreak.[1][2]

It was officially announced on November 19, 2017, and released on March 6, 2018.







  • Due to backlash surrounding a number of controversial changes, Ubisoft is giving away Ash's Sidewinder Elite Uniform upon the season's release to those who play the game between the announcement made on January 26th, 2018 and its release date.[3]
  • Due to a deployment issue, the Sidewinder Elite Uniform was unable to be released properly for everyone on the day and had been temporarily removed until it was eventually fixed.[4]