The level of radiation leaking from Japan's crippled Nuclear Plant was raised today from a 4 to a level 5. The last level 5 that the world saw as at 3-Mile Island in 1979 when there was a partial meltdown of the reactor. This was the worst Nuclear accident in US history.
According to the International Nuclear Events Scale, a level 5 equates to the likelihood of a release of radioactive material, several deaths from radiation and severe damage to a reactor core.
For comparison Chernobyl in the Soviet Union was rated 7 on the same scale.
Despite desperate attempts to cool the reactors with dropping water and aiming water canyons at it the level continues to rise.
There is now talk of a last ditch attempt to bury the nuclear plant under sand,dirt and concrete in order to control the radiation and minimise the danger.