Surviving examples of early underground ciné films are rare, some of the best being those produced by E.K. Tratman between 1933 and 1937. The earliest of these was intended as an experiment to determine the difficulties in filming underground and was made in Goatchurch Cavern, Read’s cavern and other caves. This lead to a more ambitious project filming the descent of Lamb Leer in 1937. This paper places Tratman’s films in the context of caving films produced elsewhere and details their production.