On Saturday, NewsHour Weekend explores potential relief to California's water crisis. Well into the fourth year of the state's historic drought, San Diego County is preparing to open what many say represents the best hope for a drought-proof water supply: the largest ocean desalination plant in the Western Hemisphere. The $1 billion plant will convert millions of gallons of saltwater from the Pacific Ocean into fresh, drinkable water every day for San Diego. The plant has drawn critics, though, who question the cost and environmental impact of desalination. Get a peek inside the newly constructed plant before it opens later this year, with Special Correspondent Mike Taibbi, as he examines the role desalination may play in California's water supply.