Résumé : Decompression accidents of the inner ear are fairly common even after dives made in technically correct conditions. They are due to the terminal nature of the cochlear and vestibular arteries, and are increased by cold and stress reducing the arterial calibre. They should be treated, like other forms of decompression accident, as rapidly as possible with vasodilators and anti inflammatory drugs, but above all with hyperbaric oxygen. This last is a particularly valuable treatment and gives good results even if applied relatively late, for instance eight days after the accident as in one case here described. In another case it was tried after six months but this time without any beneficial effect.