SCP-966 also referred to as "The Sleep Killers¨ are a nearly invisible anomaly that attack any nearby players.
SCP-966 is contained at Sector 3 to the right after entering from sector 2. It is located on the left side.
SCP-966 is one of the fastest SCPs in sector 3, just behind SCP-457. It will attack any nearby player doing around 25 damage each hit. There is 4 instances of 966 in the chamber that will spawn.