Here’s the first 10 minutes of a documentary called Extraordinary People: The Boy Who Sees Without Eyes. It’s about Ben Underwood, a blind teenager from Sacramento who uses echolocation.
At the age of 2, Underwood was diagnosed with retinoblastoma, a rare form of cancer that that affects about one in 5 million children. One year later, his eyes were surgically removed, to prevent the tumour from spreading throught the optic nerve and into the brain.
Soon after his surgery, Underwood realized that he could use echoes to determine the positions of objects, and began to develop this “six sense.” His ability to echolocate is now so sophisticated that he can ride a bike, skateboard and play computer games.