The Delivery Man (2015)

S44E25 Killer Floods

Across the globe, researchers are uncovering evidence of colossal ancient floods that surpass even the most devastating modern flood events. What caused these catastrophic deluges, and is there a chance they could reoccur? In Washington State's Channeled Scablands, the flat prairie transitions into extraordinary, massive rock structures, revealing the dramatic impact of these historical events.