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The earthquake in the mountains of Sichuan Province may cause a second catastrophe. ABC's Stephanie Sy (embargoed link) reported on so-called quake lakes Wednesday; now Mark Mullen files from the city of Mianyang for NBC's In Depth. The earthquake triggered landslides in narrow valleys that formed dams, blocking the flow of rivers. Rising waters behind the dams have turned into three dozen or so giant lakes, which will flood downstream cities if they burst. Sy showed us civil engineering efforts to remove the rocks and restore the water flow. Mullen went uphill to a tent village 2000 feet above the city where residents wait to see if the brand new Tangjiashan Lake, "something that did not even exist a month ago," will burst its banks and inundate their homes.
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