Why does it seem so hard to build big things nowadays? Our guest this week points out that no one project embodies that cynicism quite like Boston’s Big Dig. Boston’s Central Artery/Tunnel Project, commonly known as the Big Dig, was the most complex and technically challenging highway project in American history. Ian Coss is host and creator of “The Big Dig” podcast, produced by GBH, which unpacks why the endeavor was so difficult and what it represented more broadly about ambitious efforts like it. He joins WITHpod to discuss lessons learned from the project, his storytelling process and why big infrastructure projects so often fail.