The nuclear reactors at Fukushima leaked cooling water into the ocean and local land. Much work has gone into containment. The problem with the core hasn’t gained as much attention because there are too many unknowns, but it is the bigger problem. Ideally, the melted core should be disassembled, separated, and then stabilized. As a pile, the radioactive materials maintain a heightened radioactive reaction. Unfortunately, there are doubts that the technology exists to: 1) assess the situation, 2) reach into the core, 3) manipulate the material, 4) move the material to safer onsite locations, and 5) undoubtedly an unknown will be found. Will it be necessary to create a Chernobyl style sarcophagus? No one knows.