the rebuilding of the world trade center for months. we have seen amazing progress and some of the dedicated workers behind the progress. tonight shepard smith shows just how dedicated they are. it's beautiful. >> joe and his crew are working 70 feet below street level on the foundation of tower 3, one of three world trade center buildings being built by silverstein properties. >> so you have to keep going. >> reporter: for joe, the cold beats the heat any day. >> i think it's too hot in the summer.