Overview
The plot revolves around a rivalry between sand-hog "Hard Rock" Harrigan (O'Brien) and his foreman Black Jack Riley. At the center of their conflict is their mutual affection for heroine "Andy" Anderson (Irene Hervey). But when the chips are down and Riley is trapped in a tunnel cave-in, it is Harrigan who comes to the rescue.
| Actor | Age then | Age now | |
|---|---|---|---|
 | 36 | September 4, 1985 (86) | |
 | 25 | December 20, 1998 (89) | |
 | 47 | October 28, 1938 (50) | |
 | 21 | January 28, 1996 (81) | |
 | 43 | January 9, 1936 (43) |