First of two parts

The March 11 monster tsunami that hit the Fukushima No. 1 nuclear plant destroyed the critical backup power system and triggered the meltdown of hundreds of fuel rods in reactors 1, 2 and 3.

Video of the appalling damage and reactor building explosions led many — from regular people to nuclear and quake experts — to ask: Why wasn't the coastal nuclear plant built in a location safe from all tsunami threats?