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.
Director:
George O'Brien
Tim 'Hard Rock' Harrigan
Irene Hervey
'Andy' Anderson
Fred Kohler
Black Jack Riley
Dean Benton
Michael McGinnis
Frank Rice
McClintock, Superindendant
