large air bubble on a deep dive

[Powertrip]

I haven't even taken my rec OW course, but my brain is always going on about what ifs. So here we go... You're on a deep dive, say 600-800 feet. in a cave and you walk out into a dry cavern... what kind of havoc is this going to play on decompression? or say a longer dive at 200-400 feet and then you pop up into air in a cavern... Your body clearly isn't under the same pressure as when in the water. My mind says you'd be in pretty rough shape, but on youtube I'm seeing videos of guys cave diving and coming up into air pockets and chilling for awhile. Same for people using diving bells as deco stops. is there a lot I just haven't learned yet/missed?

 

[BoltSnap]

You're on a deep dive, say 600-800 feet. in a cave and you walk out into a dry cavern

or say a longer dive at 200-400 feet and then you pop up into air in a cavern...

is there a lot I just haven't learned yet/missed?

Yes, take a scuba course with a qualified and certified scuba instructor first.

(May God help your instructor)

 

[Ukmc]

I haven't even taken my rec OW course, but my brain is always going on about what ifs. So here we go... You're on a deep dive, say 600-800 feet. in a cave and you walk out into a dry cavern... what kind of havoc is this going to play on decompression? or say a longer dive at 200-400 feet and then you pop up into air in a cavern... Your body clearly isn't under the same pressure as when in the water. My mind says you'd be in pretty rough shape, but on youtube I'm seeing videos of guys cave diving and coming up into air pockets and chilling for awhile. Same for people using diving bells as deco stops. is there a lot I just haven't learned yet/missed?

You are on the dive 600-800 feet? Sounds amazing…
no worries about air pressure change. Your air pocket will be pressurized to an ambient pressure, otherwise the water column would fill the space.
Diving is great from both experiences and continuous learning standpoint. Good luck, you will do great!

 

[Powertrip]

Yes, take a scuba course with a qualified and certified scuba instructor first.

(May God help your instructor)

Oh god please don't tell me my question is that bad haha. I enjoy knowing how things work and while I wait for my chance to take a class, my mind wanders and thinks about various scenarios. This seemed like with the depth it would've been something not covered by a basic open water class.

Thank you both for answering/indulging my newbie question.

 

[BoltSnap]

Oh god please don't tell me my question is that bad haha. I enjoy knowing how things work and while I wait for my chance to take a class, my mind wanders and thinks about various scenarios. This seemed like with the depth it would've been something not covered by a basic open water class.

Thank you both for answering/indulging my newbie question.

You will know "how bad" when you take the course

 

[loosenit2]

you may have gathered from some of the sarcastic responses that your questions were way out of the ballpark.

As a new Open Water diver you should be in depths above 60 feet until you have built of some skills and experience. The no-decompression limit is 130 feet. The vast majority of diving is done within no-decompression limits. Doing planned decompression dives or diving in an overhead environment (i.e. cave) is considered technical diving and requires a great deal of training and practice. Cave diving is considered an activity that only the most highly trained, experienced, and skilled divers will do.

 

[Powertrip]

To clarify, I was asking this not because I wanted to do it. I know this is far beyond a rec diver's skillset or experience. I don't know if any of you have seen my other post about a story I'm writing but I was asking because I had a plot item I was considering including which did involve deep diving and a cave. But I wanted to get the details right. I'd understand if I'd said I was planning on doing deep dives or technical dives once I got my certification but I thought I'd made it clear this was a hypothetical.

I know that it's hard to tell intent and I'm sure when reading my question you guys rolled your eyes, but the sarcasm turned me off to asking questions on here anymore beyond gear recommendations or destination suggestions

 

[Wibble]

I haven't even taken my rec OW course, but my brain is always going on about what ifs. So here we go... You're on a deep dive, say 600-800 feet. in a cave and you walk out into a dry cavern... what kind of havoc is this going to play on decompression? or say a longer dive at 200-400 feet and then you pop up into air in a cavern... Your body clearly isn't under the same pressure as when in the water. My mind says you'd be in pretty rough shape, but on youtube I'm seeing videos of guys cave diving and coming up into air pockets and chilling for awhile. Same for people using diving bells as deco stops. is there a lot I just haven't learned yet/missed?

The "air" trapped in the "bell" will be at the same pressure as the water. You would not breathe that air as it could be foul. All the time you're at that depth you are incurring a lot of decompression time.

We don't dive that deep and definitely not with air; only the most expert divers could do a dive to that depth (in recreational scuba) using exotic helium mixes which aren't breathable on the surface. The bottom time would be measured in minutes with many many hours of decompression -- 10h, 12h, even longer. It requires extreme planning and very specialist equipment especially for redundancy (failure mitigation).

Commercial "deep sea divers" would work at that depth for days doing "saturation diving". They use hundreds of millions of dollars of equipment and have hundreds of people looking after them. They get paid a lot of money too and it takes a week to come to the surface after spending their two weeks at depth.


Watch the film "The Last Breath" -- very interesting. Spoiler: nobody died!

 

[Bubblesong]

I know that it's hard to tell intent and I'm sure when reading my question you guys rolled your eyes, but the sarcasm turned me off to asking questions on here anymore beyond gear recommendations or destination suggestions

If you think the responses are insensitive now, your gear questions are going to set off the trolls far more. Equivalent of “Your gonna die, you fool!” Will be posted about any gear option you consider that the troll does not agree with, up to and including your Spider-Man Vs Aquaman panties. A thick skin and the member-block option will serve you better than not asking questions.

 

[clownfishsydney]

I cannot even begin to understand why a potential diver would ask a question like this!