Crippled by a tsunami of unprecedented scale, one of the reactors at Japan’s Fukushima Daiichi nuclear power plant is in danger of melting down. To save it, workers must do the unthinkable: Vent radioactive steam into the atmosphere, to avoid a larger catastrophe as explosive gasses build up inside the reactor core. And they must risk exposing themselves to dangerous levels of radiation to do it. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.