really fascinating is this beach manhole. we think of the way in which we connect to the internet. maybe it goes up to a satellite. it's here, it's under the sand we actually connect. take a look at the screen folks at home. what is this? what are we looking at here that. >> is a manhole on a beach near lisbon in portugal. this is the place where 5,000-mile undersea cable goes down the western coast of africa land. this is the spot where it connects to the continent. >> these cables connect and send email goes off to servers or data centers in some part of the world and it's routed back. >> yeah. almost like air travel. always traveling through these major hubs going internationally. internet same way. passes through a small list of buildings. >> facebook had a pretty big outage for a few hours i think the other night. barely measured a blip. when a massive company like facebook goes down and barely measures a blip. what does that say about the size of the internet. >> there is a lot of it. we're online all the time.