The case of a 28-year-old patient in which a peripheral facial paralysis occurred during raise of diving is reported. In reviewing the literature several conditions are mentioned and discussed as fortuitous causes of peripheral facial paralysis, being emphazised an North-American report about two patients suffering five episodes of transient seventh nerve paresis during ascent to altitude, where a disequilibrium of pressures between the middle ear and the nasopharynx was assumed to be the efective cause of the Bell's palsy. A similar mechanism was admited for the reported case.