A most recent news told that they had detected 3200 Bq/l radioactivity in the underground water from a well close to the 1st reactor at Fukushima nuclear plant. It has been reported the cooling water was contaminated by radioactive substances. I suspect it is not the case with the present situation. The major radioactive substance is Cs, which could be absorbed easily by soil. If the underground water is generally contaminated, the source of contamination must be close to the underground water path.
The nuclear fuel has been melted. Nothing is known yet to what extent it got through. Since the casings are known to have been broken, we could speculate that the fuel got through the concrete beneath the casing. If the underground water are contaminated by sources close to the water path as told above, the melt down fuel must be the most likely cause for that.
The power line planned to take the fuel out of the reactor after it is fully watered. Since the casings are all damaged, however, it won't be possible for them to do that. Another project to do that in dry environment is under consideration. It could be quite difficult due to extremely high radioactivity from the fuel. They should manage to take the used fuel out and place them under control. But no exit for that solution yet at all.
At the IOC meeting a few days ago, our prime minister has made an obvious lie in his address saying that the Fukushima nuclear plants were under control. The accident is still least dealt with now. Even if he wanted to invite the Olympic games to Tokyo by some means or other, he should not have told about it in that way. It hurts the people in Fukushima.
The Fukushima nuclear plants are still far from control.