The Phantom Empire
"When a man-eating cave creature appears with a fortune in uncut diamonds around his neck, Dr. Chambers' daughter Denae hires a salvage company to find the underground source of the gems. Accompanied by archaeological intern Andrew Paris, mineralogist Professor Strock, and the salvage company's Cort Eastman and Eddy Colchilde, Denea's hopes of emerging from her famous father's shadow become as remote as getting out of the caves alive!"
Starring Ross Hagen from Wonder Women and the impeccable Sybil Danning, this pulp throwback would be perfect for the guys to Riff.