The music from this clip and http://www.videosift.com/video/massive-attack-1946-atomic-bomb-test-at-bikini-atoll mix really well together.

This is a fan video by the same person who did:
modern life is a techno paradise (underworld + koyaanisqatsi)
1946 atomic bomb test + massive attack "angel"
1944 Democratic Revolution in Guatemala + radiohead

very talented...

Those are old ships floating in the still waters surrounding the Marshall Islands and Bikini Atoll... meaning this is not "Little Boy" and there aren't any civilians being murdered in this particular footage.

... also the sound syncing up to the explosion is strange to me.