Summary form only given as follows:- The possibility of theprolonged stay of aquanauts in an hyperbaric environment is conditionedby the life support system (LSS) functioning. The survival of people inextreme or emergency situations with the help of the complex ofemergency systems rescue units is required. Three working regimes haveto be considered; compression, isopression and decompression. Theseregimes differ in duration, pressure values, gas composition. Humiditycontrol and heating systems are discussed
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