Decompression sickness practices in lobster diving among the indigenous Miskito people, who face great economic pressures. At that time it was estimated that in the country over 2000 divers had been injured and 300 others had died since the 1970s. In the United States, it is common for medical insurance not to cover treatment for the bends that is the result of recreational diving. This is because scuba diving is considered an elective and "high-risk" activity and treatment for decompression sickness is expensive. A typical stay in a recompression chamber will easily cost several thousand dollars, even before emergency transportation is included.
Investigation of diving accidents a gas may be toxic or insufficient to support consciousness if used at an inappropriate depth, and the inert gas components will not be correctly accounted for in decompression calculations, which might result in decompression sickness. Both oxygen toxicuty and hypoxia may render the diver unconscious without warning, and decompression sickness symptoms may be debilitating if severe, and are generally unexpected. Open circuit scuba is generally very reliable if correctly maintained and serviced, and tested before the dive. Maintenance and testing procedures are simple and few in number, nevertheless divers may neglect them due to complacency, distraction or incompetence. Rebreather