After the death of Stalin and the arrest of Lavrentiy Beria in 1953, Światło travelled on the Berlin subway with Fejgin through the West Berlin sector where he "slipped away" and defected to the West.
After the death of Stalin and the arrest of Lavrentiy Beria in 1953, Światło travelled to East Germany on an official business trip. While on the Berlin subway with Fejgin, passing through the West Berlin sector of the city, he "slipped away" and defected to the West.