He actually did a TED talk two months ago at TED2015. It's from 4 years after the article above was written, and it's one of those talks that leaves you with lingering thoughts for days afterward.
I actually tried to do this as a sighted kid. I got good enough fairly quickly to find the doorway in a dark room. Which might not seem like much, but it more or less removed my fear of the dark which is probably a useful thing.
https://www.ted.com/talks/daniel_kish_how_i_use_sonar_to_nav...