![Andrew Blum: Discover the physical side of the internet](https://pi.tedcdn.com/r/talkstar-photos.s3.amazonaws.com/uploads/b0102fcf-5c85-41a8-bcfd-2d642216e033/AndrewBlum_2012G-embed.jpg?h=200)
When a squirrel chewed through a cable and knocked him offline, journalist Andrew Blum started wondering what the Internet was really made of. So he set out to go see it -- the underwater cables, secret switches and other physical bits that make up the net.