"Japan may spend Y 47 Billion ($524 million) on steps that include constructing an underground frozen wall to block groundwater from flowing into basements at the nuclear plant, (Fukushima) Trade and Industry Minister Toshimitsu Motegi told reporters on Tuesday (3rd September 2013)"
Source: Abe to end 'ad-hoc' response to Fukushima nuclear crisis
By Takashi Hirokawa and Yuji Okada
Australian Financial Review
Wednesday 4th September 2013, page 36