I’m beginning to wonder about the construction of this place. It wouldn’t make sense to build an underground colony with so many hidden passage ways unless somebody involved with the design/construction really distrusted somebody else and found a need for being able to hide out. It could be that the mammals involved in this place’s construction really didn’t trust the “Reptilians” to allow them to stay. Seeing Jim perched on what looks like a roof makes me wonder if they didn’t either find or excavate a cavern and then build the walls and ceilings so that their living quarters had a more regular appearance. It also may have been easier to heat an inner building than the whole cavern.