Minnesota Public Radio slideshow:
What lies beneath?
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Hurricane Katrina evacuee Sandra Nelson holds up information about where her son Walter has been sent with Nelson's sister to a shelter in Oklahoma, 06 September, 2005, outside the Astrodome in Houston, Texas. Nelson was looking for transportation to Oklahoma to find her son. (STAN HONDA/AFP/Getty Images)

Hurricane Katrina evacuee Sandra Nelson holds up information about where her son Walter has been sent with Nelson's sister to a shelter in Oklahoma, 06 September, 2005, outside the Astrodome in Houston, Texas. Nelson was looking for transportation to Oklahoma to find her son.

(STAN HONDA/AFP/Getty Images)
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