(see also) https://www.britannica.com/biography/George-Blake-British-diplomat-and-Soviet-spy https://www.britannica.com/biography/George-Blake-British-di... Ge

(see also) https://www.britannica.com/biography/George-Blake-British-diplomat-and-Soviet-spy https://www.britannica.com/biography/George-Blake-British-di... George Blake was mentioned in the story as having known about, and relaying information to the Soviets about the tunnel during its construction.