The City Under the City: How Did They Build NYC's Subway Without Computers?

Every day millions of people disappear beneath New York City... and come back up like nothing happened. But think about it: How did engineers over 120 years ago build hundreds of miles of tunnels beneath one of the busiest cities on Earth without GPS, computers, drones or modern technology?

In this episode of IDKMYDE, we're going underground See for privacy information.