This video from Japan says about itself:
Fukushima ‘ice wall’ sparks serious concerns
9 July 2014
Officials at the Fukushima Daiichi nuclear power plant in Japan have invited TV crews to showcase the underground wall of ice they’re building to stop radioactive water from leaking from the facility. But as Al Jazeera’s technology reporter Tarek Bazley reports, some experts say the project is flawed, and could create more problems than it solves.
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