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Diving Physics: Discuss Question for friday in the Training Area forums: right if you were on a dive to 85 meters on a new wreck 25 minutes into it and you ...

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Old 19-01-07, 04:32 PM
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Smile Question for friday
right if you were on a dive to 85 meters on a new wreck 25 minutes into it and you come across a sealed room in the wreck which has air trapped there, big enough area to get out of the water altoghather and sit there, so the question is

a, would you need to do decompression before going into that area

and

b, as it was air from the surface would it be safe to breath and not flip out?

max deapth of air 66 meters

just somthing to play with as i know cave divers have stage tents

graham
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Old 19-01-07, 04:34 PM
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Quote:
Originally Posted by milldog
a, would you need to do decompression before going into that area
No, the air pocket would be at ambient pressure.
Quote:
b, as it was air from the surface would it be safe to breath and not flip out?
Probably, not definitely, and certainly not indefinitely.
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Old 19-01-07, 04:44 PM
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No and No
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Old 19-01-07, 04:47 PM
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and I keep telling you, were not going to 85m
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Old 19-01-07, 04:50 PM
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Quote:
Originally Posted by milldog
a, would you need to do decompression before going into that area
No for the same reasons given by Tricky
Quote:
Originally Posted by milldog
b, as it was air from the surface would it be safe to breath and not flip out?
Same as tricky because:

The air would be "fresh" as long as you can guarantee that you were the first there. To guarantee the quality after the first breath, each exhalation must remove the breathe from the area - and therefore the volume of the area would reduce by that breathe.

Same as uwila because: the risks and hassles are too great
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Old 19-01-07, 04:58 PM
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The ppo2 would be a bit on the high side wouldn't it?
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Old 19-01-07, 05:01 PM
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Quote:
Originally Posted by JonP
The ppo2 would be a bit on the high side wouldn't it?

thats what i thought but i might be wrong
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Old 19-01-07, 05:02 PM
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To add a little detail to my thinking
The air would be at ambient, so no deco needed.

The air would be at ambient, so the ppO2 would be a touch higher than recommended if you wish to avoid an O2 hit. Still, if you were totally out of the water, there might be no risk from drowning and I've heard it said that it's not the O2 hit which is dangerous, just the drownig as you fit. So maybe it would be 'interesting' rather than dangerous
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Old 19-01-07, 05:08 PM
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Quote:
Originally Posted by uwila
The air would be at ambient, so no deco needed.

The air would be at ambient, so the ppO2 would be a touch higher than recommended if you wish to avoid an O2 hit. Still, if you were totally out of the water, there might be no risk from drowning and I've heard it said that it's not the O2 hit which is dangerous, just the drownig as you fit. So maybe it would be 'interesting' rather than dangerous
Unless you bashed your head on the side
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Old 19-01-07, 05:15 PM
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uwila uwila is offline
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Quote:
Originally Posted by JonP
Unless you bashed your head on the side
Very true and it might be fairly difficult to 'sober up' and get back out again.

No doubt Graham will let us all know after he's tried it
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