I have reported before about the FEMA Concentration Camps and the Executive Orders the president would have when Martial Law is declared however FEMA also has underground camps that can house untold amounts of civilians. Here is a quick video of FEMA's director of Communication Moorie Goodman answering some questions about FEMA and refusing to answer some very basic questions about these camps.
It is very odd that Goodman can't even say how many people these facilities can house. The following is an article about the FEMA camps and the Underground Government.
FEMA and the Underground Government