Why the internet did not go down during the earthquake in JAPAN?

http://tiny.cc/lfnihw

I stumbled across this only because in a few days
I'm getting AT&T fiber optic network for my P.C.
I'm getting a new router that works with it.
I was using their DSL with no problems.

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Bottom line with the disaster in Japan, that there
are so many crisscrossing internet connections that,
like the human body, they can repair themselves.
Your heart/body can create a new artery, if one is
blocked and can work around it (not all the time, but sometimes)
Like the ad where the robotic machines repair each
other if there is a disruption.
.