The U.S. military is home to some of the world's most cutting-edge engineering projects. Special behind-the-scenes access reveals the advanced technology and innovative design methods required to build and operate them. This is a mashup of S05E07, "U.S. Navy's Aircraft Carrier" (Ford-class) and S07E03, "F-35 Fighter Jet."

Engineers in Seattle, Washington, are building the world's first floating railway bridge using one of the Interstate 90 floating bridges over Lake Washington. To tackle this complex engineering challenge, they use new, innovative construction technology that enables high-speed trains to go where they've never gone before.