It was a two part Superman TV show, apparently it was a one hour theatrical release movie that they split into the pilot for the Superman series with some changes (I never knewthat until today). It was way creepy and I was way young.
https://en.wikipedia.org/wiki/Superman_and_the_Mole_Men#:~:text=Superman%20and%20the%20Mole%20Men%20is%20an%20independently%20made%201951,Produced%20by%20Barney%20A.&text=The%20film's%20storyline%20concerns%20reporters,the%20world's%20deepest%20oil%20well.