The New York Times has created a helpful graphic representation explaining basic facts and chronological events in the worsening nuclear emergency at the Fukushima Daiichi nuclear power plant in Japan. Just click through the succeeding steps to see various angles on the reactors, including three-dimensional/cross-sectional views: http://www.nytimes.com/interactive/2011/03/12/world/asia/the-explosion-at-the-japanese-reactor.html?ref=asia.