Nuclear options

After disaster shakes Japan's Fukushima reactors, we're looking at the options. Cleaner, cheaper and plentiful, India is currently constructing the world's first thorium-fed nuclear reactor promoted as a safe alternative to our current uranium powered plants. Meanwhile French scientists go underwater submerging nuclear stations deep beneath the sea. Finally, what happens when it all goes wrong meet the liquidators those who risk their lives trying to avert disaster.