icon-close icon-dropdown-arrow icon-edit icon-google-play icon-ios icon-key icon-live-tv icon-my-videos icon-navigation-arrow icon-preview-with-circle icon-preview icon-search icon-showinfo icon-showlistings-player icon-watchlist-add Layer 1 icon-watchlist-remove

SIGN IN WITH YOUR TV PROVIDER

You’re just a few clicks away from the show you want to watch. Please sign in with your TV provider to watch this episode and other great programs.
Now Playing
How Do They Do It?

Make Military Helicopters, Design Metro Systems, Engineer Artificial Reefs

Season 3 Episode 20
How Do they: Make Military Helicopters, Design Metro Systems, Engineer Artificial Reefs
  • 23 min
  • TV-G
  • Premiered 11/19/2009