Soren Wheeler takes us to Butte Montana--where an open pit copper mine’s demise leads to a toxic lake filled with corrosive runoff. Reporter Barret Golding goes to visit the pit lake, and writer Edwin Dobb tells Soren the story of a pile of dead snow geese who made an ill-fated landing on the water. Soren also talks to husband-and-wife chemists Andrea Stierle and Don Stierle, whose startling discovery reveals the secret life inside a death trap.