Helen Andrews is a former cryptanalyst and a Chelsea Pensioner at the Royal Hospital Chelsea. Andrews joined Bletchley Park as a cryptanalyst aged 17 in 1945 and served with the from 1945 to 1948. Andrews came to the United Kingdom from South America aged 17 in an Atlantic convoy that took four weeks. The convoy was not permitted to stop, and three vessels in the convoy were sunk by German U-boats. She is a gifted mathematician and had a place at Cambridge University. Andrews was driven straight to Bletchley Park from Tilbury Docks after being told by the captain of the ship that "A man is waiting for you. Get in his car and don't ask any questions". She only began sharing her war experiences 70 years after the war ended.<ref name=BBC2019/>