Light goes in on one end of the ocean and comes out on the other, and it usually comes from a building called a landing station that's often tucked away inconspicuously in a little seaside neighborhood, and there are amplifiers that sit on the ocean floor that look kind of like bluefin tuna, and every 50 miles they amplify the signal, and since the rate of transmission is incredibly fast, the basic unit is a 10-gigabit-per-second wavelength of light, maybe a thousand times your own connection, or capable of carrying 10,000 video streams, but not only that, but you'll put not just one wavelength of light through one of the fibers, but you'll put maybe 50 or 60 or 70 different wavelengths or colors of light through a single fiber, and then you'll have maybe eight fibers in a cable, four going in each direction.