Earthquakes. Tsunami. Nuclear Emergency. The chilling set of dominoes that dropped in March 2011 and devastated northern Japan have now largely coalesced into one word - Fukushima. First, the intimidating power of the earth’s natural forces that lifted ships and deposited them inland, that swept and crushed entire towns and communities and that took thousands of lives. Then the intimidating, destructive power of a ruptured, crippled nuclear plant, tainting the sea and land and rendering swathes of heavily populated areas, uninhabitable. For North Asia Correspondent Mark Willacy it’s been a dominant and defining story. Now - as he visits the hot-zone one last time - a new and disturbing development.