2209: As dawn breaks across Japan, the scale of the disaster is becoming clearer. Fires are raging across Kesennuma in the north-east, according to the Jiji Press news agency, and one-third of the city has been submerged by the tsunami. The city of Sendai and the surrounding farmland were devastated by the tsunami. The Japanese government is deploying hundreds of planes and ships in a relief operation. It has also requested some foreign search and rescue teams to help. 2153: The pressure inside one of the six Boiling Water Reactors (BWRs) at the Fukushima-Daiichi plant has built up because the cooling system was damaged by the earthquake. The heat produced by the nuclear reaction inside the core still needs to be dissipated even after a shutdown. If the outage in the cooling system persists, eventually radiation could leak out into the environment, and, in the worst case, could cause a reactor meltdown, experts say.