Zombie-Like Beings And Alien-Like Beings Underground?

File:Dawn of the dead.jpg
Source: Wikipedia

Last night I only remember part of my last dream, which was pretty interesting, but I do not remember the beginning of the dream; and so it does not make that much sense without the beginning of the dream.

I remember entering or being in an underground area that was similar to the underground museum of ancient cultures that has been in a few of my past dreams, and I was either with several people and/or I found several people; but I am not sure why we were in this underground area, and I can not remember what happened during this part in the dream.