How Do They Do It? (UK)

Oil Refinery, Swiss Army Knife (4x19)

Air date: Dec 13, 2010

Robert Llewellyn finds out that although the bulk of the world's oil comes from the Middle East, more than 200,000 barrels are produced each day in Texas, and he explores the production process at a vast refinery outside Houston. Plus, a report on how the Swiss Army knife is made.