To re-contain SCP-106 you need a keycard with access to Keter-class SCP's. It allows to unlock the doors to the machine which allows you and your teammate to re-contain. Why you AND your teammate? Because the machine kills the player in it. That's not the end yet. The second player needs to push the red button which states: SCP-106 RECONTAINMENT PROCEDURE. When you'll hear screaming, you know that you did it.