From electric cars to spacecraft, tech titan Elon Musk is widely known as an industry disrupter. Tuesday night in Los Angeles, Musk unveiled the very first tunnel in what he hopes will become a network of underground highways. The test tunnel runs between the headquarters of Musk's SpaceX company and a parking lot behind a shuttered business a little over a mile away. "CBS This Morning" co-host Gayle King takes a ride through the new tunnel and talks to Musk about what inspired him to build it.