millions of americans. it's something the agency denies, sort of. let's bring in jim sciutto to explain. he's in washington. good morning. >> it's been interesting to hear from the nsa from this, denying they spy on the servers themselves but not on links, pictures cables under the ocean carrying billions of bits of data a second. the agency will argue that's its job to spy on foreign targets overseas. it's another way the nsa seemed to expand its global reach, exposed by not the kind of document you'd expect out of the nsa. >> reporter: explained in this simple hand sketched drawing, complete with a smiley face may be the way the nsa is monitoring the internet. documents released by edward snowden reports the intelligence agency tapped into the communications link such as undersea cables connecting yahoo! and google data centers around the world. because they are overseas, they