CNN gives viewers a firsthand look at how a terrorist mastermind builds two bombs. Nic Robertson reports. This report is based on a one-year investigation by CNN into air cargo security in light of a thwarted plot by al Qaeda in October 2010 to blow up cargo jets over the United States. "Deadly Cargo" airs on CNN Presents, Saturday and Sunday February 18, 19 at 8 p.m. ET.