Descent Into Darkness
- Episode aired Jul 23, 2020
- TV-14
- 42m
It's pedal to the metal as Zak and the guys review their iconic underground investigation into a famed Route 66 destination -- the Grand Canyon Caverns.It's pedal to the metal as Zak and the guys review their iconic underground investigation into a famed Route 66 destination -- the Grand Canyon Caverns.It's pedal to the metal as Zak and the guys review their iconic underground investigation into a famed Route 66 destination -- the Grand Canyon Caverns.