- Some physiological functions of the divers have been observed during simulated He-O2 saturation diving experiment at depth of 302 m, the results are as follows:- There were two types of modifications of electroencephalograph after arriving at the maximum depth: increase in θ or even in δ activity in all regions, decrease in α rhythms with decreaes of its amplitude. At 302 m the index of θ rhythm was increased, the index of α waves was decreased.- During the increasing compression from the surface to 150 m the tremor presented no significant modification in subject No. 1. But the amplitude of the tremor showed significant increase in sujects No. 2 and No. 3. The maximum amplitude changes for the tremor were observed to occur on this condition in subjects No. 2 and No. 3.- In all cases a decline in heart rate was observed upon compression to saturation depth. The changes of ST- T wave of divers were not obvious, of all three divers there was no obvious lowering of S- T segment in the electrocardiograms at any depth; neither was the T wave inverted, diphasic or flat on the standard and chest leads with R wave as the main. At depth of 302 m there were no sings of abnormal changes in S-T segment and T wave even with physical loading.- The results of measurement of ventilatory paramenters were as follows: After the subjects had arrived at the depth of 302 m from the surface, the lung volume showed little changes. But the time vital capacity, the maximum voluntary ventilation, and the maximum respiratory flow decreased significantly with the obvious increase of the respiratory airway resistance. - Some physiological functions of the divers have been observed during simulated He-O2 full diving experiment at depth of 302 m, the results are as follows: - There were two types of modifications of electroencephalograph after arriving at the maximum depth: increase in θ or Even in δ activity in all regions, decrease in α rhythms with decreaes of its amplitude. At 302 m the index of θ rhythm was increased, the index of α waves was decreased .- During the increasing compression from the surface to 150 m the tremor no significant modification in subject No. 1. But the amplitude of the tremor showed significant increase in sujects No. 2 and No. 3. The maximum amplitude changes for the tremor were observed to occur on this condition in subjects No. 2 and No. . 3.- In all cases a decline in heart rate was observed upon compression to saturation depth. The changes of ST- T wave of divers were not obvious, of all three divers there was no obvious lowering of S- T segment in the electrocardiograms at any depth; dip wasic or flat on the standard and chest leads with R wave as the main. At depth of 302 m there were no sings of abnormal changes in ST segment and T wave even with physical The results of measurement of ventilatory paramenters were as follows: After the subjects had arrived at the depth of 302 m from the surface, the lung volume showed little changes. But the time vital capacity, the maximum voluntary ventilation, and the maximum respiratory flow decreased significantly with the obvious increase of the respiratory airway resistance.