Based on

Movies like Thunder Below (1932)

Story of an unhappy wife of oil rigger who labors in a Central American oil field. The bored Susan falls in love with Walt's good friend Ken but keeps her husband in the dark about her feelings... until he's plunged into darkness for real when he loses his eyesight. Susan finds her attentions then wandering yet another man, Davis, and Ken urges her to return to Walt.