I have some questions for you.

[neww]

I have some questions for you. I`m writening some colums about diving, so I need correct
Information about that. 1st-how deep can a man go by breath diving? How much time ~ does he need for it?! 2nd- how deep can a man go with helium-tanks, and without helium? I would also like to know about on which depth does sickness or vertigo appear. If someone has the compression table, I would be most gradefull… 3rd- this questionis very important! What would happen if a man would quickly exit the submarine which is on a deapth of ~ 50m? Is the compression inevitable in this case or would be just burst? Thank You.

 

[Diver0001]

1st-how deep can a man go by breath diving? How much time ~ does he need for it?!

A little over 100 metres. It takes a little over 4 min, IIRC

2nd- how deep can a man go with helium-tanks,

A little over 300 metres.

and without helium?

you mean just air? The physical limit is about 75 metres. The generally accepted limit for sport divers is 40 metres.

I would also like to know about on which depth does sickness or vertigo appear.

Sickness and vertigo are not depth dependent.

If someone has the compression table, I would be most gradefull…

Which one? You can try to google "PADI RDP" and then view the images.

3rd- this questionis very important! What would happen if a man would quickly exit the submarine which is on a deapth of ~ 50m? Is the compression inevitable in this case or would be just burst? Thank You.

I don't fully understand your question but the point is that a typical submarine is not pressurized on the inside. Assuming that someone could leave the submarine without the water pressure suddendly crushing them and they could make the ascent without further problems then a free ascent from 50 metres is quite possible without getting decompression sickness.

R..

 

[Rick Inman]

I have some questions for you. I`m writening some colums about diving, so I need correct
Information about that. 1st-how deep can a man go by breath diving? How much time ~ does he need for it?! 2nd- how deep can a man go with helium-tanks, and without helium? I would also like to know about on which depth does sickness or vertigo appear. If someone has the compression table, I would be most gradefull… 3rd- this questionis very important! What would happen if a man would quickly exit the submarine which is on a deapth of ~ 50m? Is the compression inevitable in this case or would be just burst? Thank You.

Hi NEWW.
Your questions may not have definitive answers, but I'll give it my best shot (others may correct/clarify).
Q:how deep can a man go by breath diving? How much time ~ does he need for it?!

A:Recreational divers have a self-imposed depth limit of 130'. Technical divers often dive to deeper depths of 300' and more. Depths much below that (assuming normal scuba diving) are for record setting only. The amount of time/air he/she needs depends on the depth. The range is vast, but many recreational dives descend at about 2 to 3 feet per second and ascend at about .5 feet per second (not counting stops). The deeper you go and the longer you stay, the more time you need to ascend.

Q:2nd- how deep can a man go with helium-tanks, and without helium?

A:Using helium gas mixtures does not, in itself, enable a diver to go deeper. What it does is reduce the effects of nitrogen narcosis at depth by lowering the percentage of nitrogen in the gas mixture, as well as lower O2 percentages which can cause oxygen toxicity at depth. That is why divers who dive deeper than 100' often use helium gas mixtures.

Q:I would also like to know about on which depth does sickness or vertigo appear.

A:Vertigo can come at any depth. Do a search on this board to learn about the different causes of vertigo, but most of them are believed to be related to the inner ear.

Q:If someone has the compression table, I would be most gradefull.

A:You can pick up a copy at you local dive shop, or see a US Navy table HERE.

Q:What would happen if a man would quickly exit the submarine which is on a depth of ~ 50m? Is the compression inevitable in this case or would be just burst?
A:Humm. I'll let someone else tackle this. But you would not burst on exiting into the water. Ascending to the surface is another (and complicated) story, depending on various factors.


Hope others give their more educated opinions to your questions!

 

[Turtle Diver]

I have some questions for you. I`m writening some colums about diving, so I need correct
Information about that..

I have a question for you, Neww. What kind of columns about diving are you writing?

 

[JustAddWater]

Those are some pretty esoteric questions. Should we alert FOX News?

 

[Rick Inman]

Should we alert FOX News?

Uncle Pug?? What do you think??

 

[ZAquaman]

Check out the APNEA Mania website for breath hold records. Here's a link: http://www.apneamania.com/code/worldrec_main.asp?typeID=wr

It's truly amazing what these guys and gals are doing. 103 Meters constant weight and 171 Meters in no limits.... Wow!!!!

So when you ask how deep can a man go.... I guess it depends on the man or woman doesn't it

Now your weird submarine question:

"What would happen if a man would quickly exit the submarine which is on a depth of ~ 50m? Is the compression inevitable in this case or would be just burst?"

I'm sure there are reams of research somewhere on this very subject. Probably some dead monkeys to prove the theories as well. I doubt if anyone could survive a "sudden" pressure change like that. But if there was a gradual change of pressure from 1 atmosphere to whatever the pressure is at 50m (5 atm?) he/she could survive an assent to the surface with no more ill affects to his body than a freediver would experience diving to 50 meters and back... Who wants to volunteer to go first???

 

[Don Burke]

3rd- this questionis very important! What would happen if a man would quickly exit the submarine which is on a deapth of ~ 50m? Is the compression inevitable in this case or would be just burst? Thank You.

Free ascent escape procedures call for pressing up the escape trunk rather quickly and getting out quickly to avoid DCS. They also call for screaming "Ho Ho Ho" into the Steinke Hood all the way up to avoid a lung embolism.

It has been a while, so I can not quote you times for depths. I do recall thinking that 300 feet was about as deep as I wanted to try it. 50 meters is doable, although I wonder how feasible it would be as an escape procedure.

Divers lock out of escape trunks on a regular basis. It is little different than other lockouts and there is no reason to expect ill effects.

Don Burke
ETCS(SS) USN(ret)

 

[neww]

-If someone has the compression table, I would be most gradefull---for a just simple manual compresion.

-Now your weird submarine question--- I am glead this have make an impression to you.

-I don't fully understand your question but the point is that a typical submarine is not pressurized on the inside---corect.

-Assuming that someone could leave the submarine without the water pressure suddendly crushing them and they could make the ascent without further problems then a free ascent from 50 metres is quite possible without getting decompression sickness---So it is posible to 300m not more…?

-A:Recreational divers have a self-imposed depth limit of 130'. Technical divers often dive to deeper depths of 300' and more. Depths much below that (assuming normal scuba diving) are for record setting only. The amount of time/air he/she needs depends on the depth. The range is vast, but many recreational dives descend at about 2 to 3 feet per second and ascend at about .5 feet per second (not counting stops). The deeper you go and the longer you stay, the more time you need to ascend---How much the man can be unther the water without movings ~?!

-Those are some pretty esoteric questions. Should we alert FOX News?---Not yet, I live to far from America J. But lately I have become a movie script writer… not fameus yet, but if I sold the story ever, I ll post the Name of the story here – ok.

 

[Don Burke]

-If someone has the compression table, I would be most gradefull---for a just simple manual compresion.

GIFs of the US Navy no-stop tables are attached.

-Assuming that someone could leave the submarine without the water pressure suddendly crushing them and they could make the ascent without further problems then a free ascent from 50 metres is quite possible without getting decompression sickness---So it is posible to 300m not more…?

The compression would have to be explosive to suddenly crush someone. The design of escape trunks would make that impossible or nearly impossible to arrange.

The problem is that gas loading starts as soon as the pressurization of the trunk starts. I see no way that an ascent from 300 meters could be made without performing some sort or decompression routine, either a very slow ascent for the last portion or decompression stops. Both of these involve control over the ascent rate and bringing something to breathe.

If this is a planned evolution, as it would be if the ability to make stops was present, I see no reason to get out so deep. I would bring the submarine shallow to lock out the divers.

If this is an escape situation, the escapee would probably die of DCS, drowning, hypothermia, or some combination of the three.