Alan Turing’s Secret “Delilah” Project

In November 2023, a large cache of Turing's wartime papers—nicknamed the “Bayley papers”—was auctioned in London for almost half a million U.S. dollars. The previously unknown cache contains many sheets in Turing’s own handwriting, telling of his top-secret “Delilah” engineering project from 1943 to 1945. This is an exclusive look at the documents, and what they reveal about Alan Turing.