A Flash in the Dark (1914)

Randall is a rich mine owner whose business affairs cause him to neglect his somewhat frivolous wife There is a mutual friend whom Randall carelessly allows to entertain his wife As a result the friend pays more than natural attentions to the woman The three visit one of Randalls mines The wife and friend go down the mining shaft in a bucket While they are yet underground a quantity of dynamite explodes The mine is filled with poisonous fumes