 There were three cables coming out of the back of the costume. Two  were for the operation of the eyes, and one was for the operation of  the mouth. Eizo Kaimai was responsible for the movement of the eyes  and the mouth. Batteries were installed in the Godzilla costume that  was made for the second Godzilla movie. They were for the operation  of the eyes and the mouth. The batteries made the costume even  heavier than the one that had been constructed for the first  Godzilla film.