"Maybe building reactors isn't such a great idea"
That could be the topic for a whole new thread. However, in hindsight it does seem reactors of the future should be built so that backup power for pumping water is not affected by submersion and cooling will carry on no matter what. It's a tough ask. Rivers can be diverted by landslides and earthquakes. Backup generators need oxygen for combustion, so can't be housed in waterproof containers. maybe they should have a huge snorkel that will suck in air no matter how big the tsunami. Anyway, it's water under the bridge now. All we can do is hold our breath and hope they get the reactors under control, and find fewer loved ones have been lost than predicted. It's an unimaginably terrible tragedy.