>>718981176
We really should've gotten more DLCs.
The slide projector was basically a setup for that: Exploring, invading and setting other worlds to right while fighting back the (((Hiss))). Going back after the Not-Mother in the Temple would've worked too.
I really wanted to visit that "city beyond the Quarry" as well, the mentions about it really sounded like https://scp-wiki.wikidot.com/scp-093