Water in regulator at depth causing panic

[GJC]

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So how is it that all those Navy submariners are able to get to the surface alive? Or are you saying that it is a fake--they really all died on the way up and the Navy is covering it up?

The deepest real life submarine escapee that survived a free ascent with no equipment that I am aware of was from 200 ft and he was bleeding from the mouth and nose at the surface.

If I recall correctly, an escape hood is used by the US Navy for depths less than 300 feet and there is a newer encapsulating suit designed for 600 ft.

 

[inquis]

Yes you do get the equivalent of a several breaths as you ascend

I just tried it with three normal (tidal) breaths and easily made it 90 seconds (ascent time from 30m) without passing out. I don't think I'm special in this regard.

 

[GJC]

I work with one and one of the first things he asked when he found out I dive is how deep I've been. That was followed up by how in sub school they had to free ascend from 150 ft to gain their NEC.

Was that with or witout a hood?

About how long ago was that?

I am sincerely interested in learning more about submarine escape training. Over the years up to recently, this was required less and less for submariners. More and more never doing it at all.

 

[GJC]

I just tried it with three normal (tidal) breaths and easily made it 90 seconds (ascent time from 30m) without passing out. I don't think I'm special in this regard.

Try a more realistic scenario. Walk around breathing normally for several minutes ( simulates kicking around on a dive) and without any warning, stop breathing after exhaing (not inhaling). Time how long you can hold your breath without distress. I last about 45 sec to a minute.

 

[James79]

Try a more realistic scenario. Walk around breathing normally for several minutes ( simulates kicking around on a dive) and without any warning, stop breathing after exhaing (not inhaling). Time how long you can hold your breath without distress. I last about 45 sec to a minute.

Is that to loss of consciousness, or CO2 driven urge to breathe overpowering you? I would suspect that on an actual CESA the continuous exhale would also be allowing a continuous CO2 offgass (no idea if it would keep up with CO2 production).

Respectfully,

James

 

[Boarderguy]

Was that with or witout a hood?

About how long ago was that?

I am sincerely interested in learning more about submarine escape training. Over the years up to recently, this was required less and less for submariners. More and more never doing it at all.

I think he did that in the early 90s with no hood. Swim up to the surface and live or don't do the training and become a bosons mate. His explanation was that it proved they could do it from normal operating depth without any assistance if needed.

 

[GJC]

Is that to loss of consciousness, or CO2 driven urge to breathe overpowering you? I would suspect that on an actual CESA the continuous exhale would also be allowing a continuous CO2 offgass (no idea if it would keep up with CO2 production).

Respectfully,

James

That's until the CO2 driven urge to breath starts to make me gag and gasp.

My guess is that CO2 is going to keep increasing until you can inhale fresh CO2 free air. The amount of CO2 in normally exhaled air is very small. But to know for sure, somebody has to do a little research and math to see what a human' CO2 production rate is vs the reduction in partial pressure during ascent.

 

[johndiver999]

I just tried it with three normal (tidal) breaths and easily made it 90 seconds (ascent time from 30m) without passing out. I don't think I'm special in this regard.

What did you try? An actual swimming ascent?

 

[Wibble]

I am sincerely interested in learning more about submarine escape training. Over the years up to recently, this was required less and less for submariners. More and more never doing it at all.

Because it is considered to be too dangerous — taking healthy people and putting them through a dangerous procedure for an event that shouldn’t happen.

A shallow sunken submarine is very uncommon compared with the significant risk of "burst lung" (and burst ear drum) during escape training for all submariners.

 

[inquis]

What did you try? An actual swimming ascent?

No, just walking around. I was refuting @glc's claim of about a minute of consciousness yielded from those three breaths. Several small breaths circumvented the urge to breath that would have been present if I had just held a large breath (3x normal), somewhat simulating the lessening of the urge to breath during an ascent.