The German armies reached the outskirts of Moscow in late 1941 and his wife and two daughters were evacuated to Kazan. Kochin, however, remained in Moscow carrying out military research.
Ang German armies naabot ang dakong labas ng bayan ng Moscow sa late 1941 at kanyang asawa at dalawang anak ay sa Kazan evacuated. Kochin, gayunman, ay nanatili sa Moscow pagdala out militar research.