Plugging the water leak boosts efforts to contain the world's worst nuclear disaster since Chernobyl.
The stricken nuclear power plant needs to dump 11,500 tons of radioactive water to continue with repairs.
Officials claim dumping four Olympic-sized pools-worth of radioactive water in the ocean will have no adverse effects.
As workers try and contain radiation leaks from Japan's damaged nuclear plant, we ask the experts about the risks.
Radioactive contamination of the sea from Fukushima is likely to be only a local problem, but may necessitate an exclusion zone.
Japan said on Tuesday it is on "maximum alert" over a crippled nuclear plant where highly radioactive water has halted repair work and plutonium has been found in the soil.
Overfishing has culled larger fish from the world's oceans, leaving smaller fish to thrive.
BP is now filling its broken well in the Gulf with cement as extra insurance that more oil will not escape.
Fishermen have been an integral part of cleanup operations, but they could end up losing their jobs for a second time.
The BP oil spill not only threatens Gulf seafood, but also the cultures and cuisines that depend on it.