I guess it was inevitable as the process of China syndrome goes on that the corium (amorphous mass of nuclear-reacting material from the destroyed reactors) would eventually reach the water table, which is not far under the foundations of the seaside destroyed facility.
|China syndrome process, from Roundtree7 (good article)|
Unlike what happened in Chernobyl, where this process was at least delayed by means of the construction of a new underground floor at the risk of the lives of many workers, in Fukushima that has not been attempted at all, plausibly because the water table was simply too shallow. The whole consequences of the interaction of this extreme heat source with the water table are not yet known (will it explode?) but one thing is clear: the radiation levels are climbing fast, especially in the water:
Water sampled from the well Monday contained 9,000 becquerels of cesium-134 per liter and 18,000 becquerels of cesium-137, both about 90 times the levels found Friday, Tepco said. The well is near the turbine building for reactor 2 and about 25 meters from the plant’s harbor.
TEPCO is dissimulating these developments by means of not updating their English language site, although the scary data is anyhow available in Japanese (still not really reliable, as Mochizuki points out).
Whatever they admit to, what is clear is that two years after the initial catastrophe the situation is not under control and looks like it will never be, releasing more and more radiation to the Pacific Ocean and the atmosphere in a destruction spiral that threatens all Humankind.