The website of the Secretariat of the National Diet of Japan Fukushima Nuclear Accident Independent Investigation Commission was closed.
 
An archive of the site is available at the Web Archiving Project (WARP), National Diet Library of Japan.
 
Webpage of the National Diet of Japan Fukushima Nuclear Accident Independent Investigation Commission(archived by WARP on October 25th, 2012)
https://warp.da.ndl.go.jp/info:ndljp/pid/3856371/naiic.go.jp/en/index.html
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Also available from the Great East Japan Earthquake Archive(HINAGIKU) are videos formerly hosted on the website of the Secretariat of the National Diet of Japan Fukushima Nuclear Accident Independent Investigation Commission.
 
List of videos available from NAIIC in HINAGIKU