What if you need to escape from the submarine
Two oxygen cylinders provide for each individual space
bottom hatch
Ensure the pressure inside the submarine is equal to the external pressure to avoid rapid decompression when opening the hatch. Open the hatch manually: Unlock the hatch wheel or handle and turn it. Be prepared for a sudden influx of water if the hatch is underwater. Exit the hole quickly and carefully, making sure others do not interfere with you. If you exit alone, move quickly but carefully in open water. Place on the mouthpiece: Secure the mask or mouthpiece around your mouth. Turn on the oxygen supply according to the cylinder instructions. Take a deep breath: Breathe slowly and deeply to conserve oxygen.
two upper hatch
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