Stalag Luft 14 was a World War II prisoner of war camp in Germany, from which the Eleventh Doctor led a group of prisoners in an escape form.[statement unclear] The Doctor's tunneling expertise was a bit off as the tunnel led directly into the Commandant's office.
In 2011, Amy Pond and Rory Williams read about this incident in the book Myths and Historical Impossibilities. (TV: The Impossible Astronaut)