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Der Speigel speaking with two experts in Germany about the frozen wall idea being planned for Fukushima Daiichi, did not get high marks for the project. Concerns included the long time the wall would need to stay frozen and the total size of the project. Another engineer was quoted as saying the frozen ring wall would fail if it was not also sealed from below.

Former head of U.S. Nuclear Regulatory Commission (NRC), Gregory Jaczko, says radioactive leaks from Japan's crippled Fukushima Daiichi nuclear plant mixed with ground water are impossible to control. [...] Jaczko: "What was unleashed was a force beyond human control. What you can do is try and mitigate that but you can't really control it. You cannot control groundwater." [...] Tepco has proposed to spend hundreds-of-millions of dollars on a "ice wall" to freeze soil surrounding the reactors and halt the flow of groundwater to the sea. [...]