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Voiceless implosives are sounds which are made on a laryngeal (glottal) ingressive airstream mechanism. The glottis is closed and the larynx as a whole is pulled downwards by means of the infra hyoid muscles. This creates negative pressure above the vocal folds which initiates a brief ingressive airflow. Voiced implosives are based on a combined airstream mechanism, i.e. a laryngeal (ingressive) and a pulmonic (egressive) one.