Fukushima 'ice wall' nearly done but doubts linger

TOKYO - Fukushima's operator on Tuesday started freezing the last section of a $320 million ice wall designed to combat widespread water contamination at the site of the worst nuclear accident in a generation.

Tokyo Electric Power began pumping coolant into the remaining 7 meters of its 1.5-kilometer underground wall, which encircles the four reactors along Japan's northeast coast.

Underground pipes circulate the coolant and freeze soil around the buildings.