ocr: SCUBA NDERWATER, DIVERS MUST breathe in - - - - air at the same pressure as the water around them. Air at a higher or. lower pressure would cause the diver'sl lungs FIRST-STAGE tol be pushed outward or inward. REGULATOR The equipment they use is called scuba (Self-Contained Underwater Breathing Apparatus). Air passes from TANK the tank to the mouthpiece through two stages ofvalves, called regulators. - - 200 SECOND-STAGE 3 AL REGULATOR J J - a MOUTHPIECE PRESSURE GAUGE
(.png)
(Dorling Kindersley).iso/article3/scub/scub0m.dib/scub0m.png)