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Summary: Naval Instructional film illustrating the technique of free ascent, the standard submarine escape procedure.
Description: The trainees are first tested to establish whether they possess a naturally negative or positive buoyancy, and are then taken through free ascent procedure in a diving tank, from depths of 15, 30 and 100 ft. The film emphasises: (1) the simplicity of the procedure; (2) the necessity of breathing out continuously while surfacing, in order to avoid damage to the lungs - "... that is the inflexible rule with all free ascent".; (3) the continual presence of numerous instructors; and (4) the paramount importance given to safety considerations during training. With the exception of one man, who is returned to the air lock because he is not exhaling properly, all the trainees finally make a successful 100 ft ascent. "With this training and with confidence in what you're doing, free ascent becomes not only a cheap passage from a difficult predicament, but an exhilarating pleasure".