Thirteen paraplegias after decompression have been treated in the 5 centres of Lyons, Geneva, Mulhouse, Basel and Strasbourg. All these cases are somehow comparable: 12 males, 1 female, skilled and well-trained divers are involved from 27 to 50 years. Submersion between 30 and 42 metres, during 15 to 30 minutes. Ascension with or without decompression stops. Beginning with sudden posterior thoracic, 4 feeling sick, 2 becoming briedly unconscious, paralysis after a while (until 1 hour). All have received hyperbaric oxygenation (from 1 to 5 hours later), with an improvement for 10. Neurological findings. 5 tetraplegics, 7 para-(5 with Brown-Sequard), and one LI. Quickly, the tetraplegics improved to a thoracic level. In two cases, paraplegia remained complete at thoracic level. The others had a better evolution; the paralysis improved slowly, with marked spasticity, impaired sensation did not improve to such an extent, often localised at a lower level, with sexual impotence. Micturitions became normal but with often urine leakages. This rather favourable evolution allowed 11 to go back to work.