Leak Plugged at Japan Nuke Plant
Old newspapers didn't get the job done, but engineers in Japan kept working to find a way to plug the leak.
Engineers injected 1,500 litres of "water glass", or sodium silicate, which solidified the soil near the cracked pit where the leak was coming from.
But nuclear experts said the damaged reactors were far from being under control, almost a month after they were hit by a massive earthquake and tsunami on 11 March. Water has been pumped into the reactors since the earthquake knocked out fuel rods' cooling systems.
Now, workers are discharging less contaminated water into the sea so more radioactive water can be stored.