With that leak sealed, the plan is to inject heavyweight "kill mud" into the lower part of the blowout preventer, followed by cement that will effectively entomb the well.

WSJ: Spill Fight Shows Progress

In like manner, I believe that reactors should be designed such that an earthquake of any magnitude could not destroy the reactor or its containment shell, further that if the reactor core was to start to melt down, the melt down itself would shut the reactor down and, at the very worst, the reactor would entomb itself with no potential release of radiation into the environment.

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