Some truthers point to FEMA's appendix C which says,
And they say that this is an important piece of evidence relevant to the collapses. Because NIST did not explore these samples, so the claim goes, their report is undermined and more investigation is clearly needed. What is the debunking response to this?"The severe corrosion and subsequent erosion of Samples 1 and 2 are a very unusual event. No clear explanation for the source of the sulfur has been identified. The rate of corrosion is also unknown. It is possible that this is the result of long-term heating in the ground following the collapse of the buildings. It is also possible that the phenomenon started prior to collapse and accelerated the weakening of the steel structure. [My emphasis] A detailed study into the mechanisms of this phenomenon is needed to determine what risk, if any, is presented to existing steel structures exposed to severe and long-burning fires."
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