This retrospective study aims at an epidemiological description of the clinical presentation of medical problems in technical diving. It assess anthropometric data, diving experience and dive planification, clinical presentation, treatment received and pronostic to understand specificity of this community.

In recent years, the increased availability of breathing gas mixtures, together with progressive technical development of specialized diving equipment, has contributed to expansion of the diver's community. Deep and long dives expose to decompression sickness (DCS) risk and hyperbaric oxygen therapy (HBO) is the definitive treatment. Incidence, clinical expression or prognosis of pathological events after technical diving might differ from recreational ones. A better knowledge of these specificity will facilitate risk assessment, analysis and medical care for hyperbaric physician community.

Inclusion Criteria:

• Civilian technical diver
• Diving accident history (decompression sickness, biochemical accident or immersion pulmonary edema) following a technical dive in a trimix and/or rebreather dive
• Treated in a hyperbaric center on the coast of mainland France

Exclusion Criteria:

• Participation denied by the diver
• Diving incident diagnosis not retained by the hyperbaric physician

Technical divers are defined by specialized equipment (e.g. rebreather) and/or helium based mixed-gases used to conduct deeper and longer dives. All divers who consulted hyperbaric installations after one of these dives with a retained diagnosis of a diving accident are eligible to participate.

All collected data that underlie results in a publication

Data will be available beginning three years and ending fifteen years following the final study report completion

Data access requests will be reviewed by the internal committee of Brest UH. Requestors will be required to sign and complete a data access agreement