Secrets of the Superfactories S01 E01 McLaren's UK supercar, Faber-Castell pencils, US STIHL chainsaws, and Japan's Shoda Shoyu soy sauce.

A look at McLaren's UK supercar production, the German factory making 500,000 Faber-Castell pencils a day, US STIHL chainsaws, and Japan's Shoda Shoyu soy sauce.