How chefs feed 100,000 Michigan fans at America's biggest football stadium

The University of Michigan's Big House is the biggest football stadium in the United States. In secret kitchens, 35 chefs make food for over 100,000 fans. But in a stadium over a century old, moving the food is a logistical nightmare. There's only one tunnel and one service elevator to transport all the food. We caught up with chefs 24 hours before kickoff to see how they cook for football's biggest crowd.