videos made sense. drug smugglers hurling their stolen vehicles back into the rio grande were doing it for one reason. to protect their dope at all costs. >> oh, we had a splash down. a splashdown. en route. >> they don't mind losing the truck into the river. at the end of the day if they can recover 2,000 pounds of march narcotics, they're going to protect that inventory. >> it's going under. just about on the -- >> reporter: inside mexico, the