Hall of Infinite Doors

The next room is a radio room. You overhear on the radio,

"This is Chimera Second Major. Zebdev in the left disposal facility! We are under heavy fire. We need reinforcements now! Anyone!!? (gunshots)(screaming)...help...us...(more gunshots).

After that, all you hear is dead silence and a bizarre laughing. Then, the radio cuts out. Footsteps headed in your direction start coming from the hallway next to you. You try to see but the hallway is pitch black. You notice a sign pointing to the darkness. It says "Left Disposal Facility".