Rob uncovers the incredible stories behind Scotland's mighty Bell Rock lighthouse, an engineering marvel built on a deadly submerged reef in the treacherous North Sea. Eleven miles offshore, this light has stood strong for over 200 years, but at the start of the 19th century, the reef was a menace causing innumerable wrecks and drowning countless mariners. As the show reveals, Robert Stevenson, a young, ambitious engineer, was determined to prove that something could be done to stop Bell Rock claiming so many lives.