Elon Musk is known for being an innovator. Having made an impact on numerous industries through the use of innovative technologies, Musk has now turned his sights toward tunneling, with the ultimate goal of making the tunnel-building process faster. Civil and Environmental Engineering Professor and Director of the Underground Construction and Tunneling center Mike Mooney weighs in on Musk’s ambitious goals. From the story: Musk wants to speed up an excruciatingly slow process to tunneling’s equivalent of the speed of light—about a mile a week. That may sound underwhelming; even a garden snail ....