I question the sanity of anyone who chooses to live below sea level.
The Dutch have done it for ages. But even they had problems over the years. Read about it here: http://www.deltawerken.com/Deltaworks/23.html
How about those in Tornado alley, or San Francisco, or NYC for terrorism, or in wooden buildings because of fire, on the ground for falling objects, shall I continue?
I question the sanity of those that question the sanity of living below sea level without having the same opinions about living: on an earthquake fault line, near a location prone to forest fires, mudslides, avalanches, tornados, flooding rivers, blizzards, extreme heat or cold spells, etc.