The player can see SCP-1048 walking across the catwalk, entering the chamber, followed by it leaving. It can sometimes be seen dancing around the checkpoints and later on in the Large Testing Chamber. In the Heavy Containment Zone and other various areas is where an easter egg can be found, SCP-1048.
If the player walks into the bathroom, there's an 80% chance of hearing SCP-789-J saying: 'I WILL EAT YOUR BUTT.' However, during and as of an unspecified update, the command ceased to work. If you type in 'halloween' into the Console command box, SCP-173's face will turn into a jack-o-lantern. In-game easter eggs Halloween costume for SCP-173