I'm currently enrolled in the OW course, and my experience includes the discover scuba course with two OW dives.
Had some general questions while studying, hopefully I can find answers here:
1. From what depth does an emergency ascent become unsafe? Both in terms of exhaling expanding gas as pressure decreases, and from a nitrogen standpoint during a no decompression limit dive.
2. During an emergency ascent, going straight for the surface, with no safety stop, do you continue to breathe if you have air supply with enlongated period of exhalation, or do you only exhale, not running out of expanding air until hitting the surface? Without air I imagine you exhale, but do you slowly exhale or get as much air out as possible? I guess what I'm wondering is, while exhaling, will the expanding gas take care of itself as long as the airway path is open or is must you vent at a specific rate?
3. If an unconscious, not breathing diver is retrieved at depth and brought to the surface by another diver is lung expansion a concern? Will the excess air escape by itself or tear the lungs to pieces? If they have aspirated water, near drowning, will there be remaining gas in the lungs or will the water prevent lung expansion injury?
All I got for now, appreciate any replies.
Had some general questions while studying, hopefully I can find answers here:
1. From what depth does an emergency ascent become unsafe? Both in terms of exhaling expanding gas as pressure decreases, and from a nitrogen standpoint during a no decompression limit dive.
2. During an emergency ascent, going straight for the surface, with no safety stop, do you continue to breathe if you have air supply with enlongated period of exhalation, or do you only exhale, not running out of expanding air until hitting the surface? Without air I imagine you exhale, but do you slowly exhale or get as much air out as possible? I guess what I'm wondering is, while exhaling, will the expanding gas take care of itself as long as the airway path is open or is must you vent at a specific rate?
3. If an unconscious, not breathing diver is retrieved at depth and brought to the surface by another diver is lung expansion a concern? Will the excess air escape by itself or tear the lungs to pieces? If they have aspirated water, near drowning, will there be remaining gas in the lungs or will the water prevent lung expansion injury?
All I got for now, appreciate any replies.