This Tuesday, Aug. 20, 2013 aerial photo shows the Fukushima Dai-ichi nuclear plant at Okuma in Fukushima prefecture, northern Japan. Deep beneath Fukushima's crippled nuclear power station a vast underground reservoir of highly contaminated water that began spilling from the plant's reactors during the 2011 earthquake and tsunami has been creeping slowly toward the sea. (AP Photo/Kyodo News) JAPAN OUT, MANDATORY CREDIT
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