Special Units from the SCP Foundation, they come when a breach is ocurred. But in the game they arrive in enterance zone. Here is a bit more info: Mobile Task Force Epsilon-11 handles internal security for the SCP Foundation, under oversight by MTF Alpha-1. They are a special ops force deployed to Foundation Sites when standard protocols fail and multiple breaches are imminent.
by S.C.PFINFO April 05, 2021