Here’s an idea, how about we make it so that you return to the lobby but it is very old; like in portal 2 where there are plants growing all through the place, bits of the walls have fallen off, rusty metal, and unattended pipes. It is like it has been abandoned without anyone even visiting the place for years and it is there left to rot.
But ey that’s just my idea and it might not be a good one as there probably should not be so much detail for modeling in an easter egg that not very people may find in the first place.