Humorist and New Orleans resident Harry Shearer gets the inside story of a disaster that could have been prevented from the people who were there. As we near the fifth anniversary of Hurricane Katrina, Shearer speaks to the investigators who poked through the muck as the water receded and a whistle-blower from the Army Corps of Engineers, revealing that some of the same flawed methods responsible for the levee failure during Katrina are being used to rebuild the system expected to protect the New Orleans from future peril.