Intense Heat Persisted for Months

• Fires continued to burn deep in the rubble pile for 100 days, despite the spraying of water onto the pile.
• When the rubble was cleared, pools of previously melted steel were discovered at the foundations.
• Temperatures needed to melt steel (~1400ºC) could not have been caused by residual hydrocarbon fires. Usually one needs a blast furnace to melt steel.