Deep freeze

This handout picture taken by Tokyo Electric Power Co. (TEPCO) on February 9, 2015 shows a measuring device of cosmic rays, to be used to look inside the nuclear reactor, being installed at the crippled TEPCO Fukushima Dai-ichi nuclear power plant at Okuma town in Fukushima prefecture.

Tokyo Electric Power Co. opens the refrigerator facility for the Fukushima No. 1 nuclear power plant to the media on Wednesday.

The facility is being used to create a frozen soil wall, freezing the ground around the No. 1 to No. 4 reactor buildings over a circumference of about 1.5 kilometers and to a depth of 30 meters.

The aim is to prevent groundwater from entering the buildings.