Japan begins building Fukushima ice wall

The operator of Japan's crippled Fukushima nuclear plant has begun work on a large underground ice wall to isolate toxic water it has produced. The 1.5km (0.9 mile) wall will be made by inserting 1,550 pipes into the ground. Coolant circulating in the pipes will freeze the surrounding soil. Some experts have expressed concerns over whether the project will work.
Background:
Japan Fukushima ice wall work starts [BBC]
Japan building giant ice wall at Fukushima after all as TEPCO gets go ahead [RT]