Light Beyond the Darkness

I recently watched an episode of a National Geography series, Welcome to Earth, in which Will Smith goes 1000 meters (more than 3200 feet) deep in the ocean in a submersible. Now it is important to understand that 1000 meters down is really pretty shallow at the oceans go. The deepest part of the ocean, The Challenger Deep off the coast of Guam is more than 10 times deeper (+11,000 meters or 36,200 feet).