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Re: PBS NOVA - Cave Diving - Tues 20:00

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Re: PBS NOVA - Cave Diving - Tues 20:00

Alan Browne11 Feb 2010 22:54
> On Feb 10, 11:35 pm, Alan Browne<alan.bro...@FreelunchVideotron.ca>
> wrote:
[quoted text clipped - 5 lines]
> that has stayed submerged for such a long time.
> Matthias

Didn't see much (any?) flesh.  Bones only.

The divers on the show were quite well suited including gloves.

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MatV11 Feb 2010 20:18
On Feb 10, 11:35 pm, Alan Browne <alan.bro...@FreelunchVideotron.ca>
wrote:

> Likewise.  I would expect at least a tissue sample for DNA analysis, or
> the skull for dental records.  Not to mention removing the gear.

Be prepared to handle a fair amount of slime when you handle a corpse
that has stayed submerged for such a long time.
Matthias

Alan Browne10 Feb 2010 22:35
>>> Just a reminder. I'm sure it will give us all a lot to blather about
>>> here ...
[quoted text clipped - 5 lines]
> I didn't see the hydrogen sulfide layer in the shakedown, it wasn't
> mentioned until later in the program.

I'm probably mixed up on the order.

> I'm surprised they didn't
> mention any effort to recover the body.

Likewise.  I would expect at least a tissue sample for DNA analysis, or
the skull for dental records.  Not to mention removing the gear.

>> Max depth was 320', rebreathing, about 4 hours (if I got all that right,
>> they didn't get into the minutiae very much, alas)
[quoted text clipped - 6 lines]
> the back except the bracket says OC. They had more open-circuit video
> than rebreather video. They did have some interesting rigs there.

I didn't mean to imply all their dives were rebreather.

>> Fellow kisses his re-breather before sealing it in its can ...
>>
>> Not for me.
>
> Nice machine, good machine, treat me well. Blessings of the lord
> Darwin be upon us. :)

More like "Lord Darwin, please look the other way today..."

>> I could see going into a largish cave (always room to turn around
>> everywhere) for a reasonable straight-ish line for a 100 meters or so,
>> but that would be more than enough.
>
> 100 meters is a lot of overhead distance for a beginning caver.

If you mean horizontal distance "in" and to a depth of of no more than
100 feet or so, as long as there was always lots of "turn around room"
everywhere with ZERO marginal passages and no exploring side caves, I
think I'd be fine to 100m in and back.

Let's add no current to that equation.

But given my ignorance, what would be the starting "typical" scenario
for a cave diver?

In San Andres on the deep dive I did swim a tunnel about 30 meters (in
one end - out the other) inside a wall.  I was a bit nervous to be sure
(esp. as the guy ahead of me was taking his sweet time), but I could see
the other end as well.  That tunnel had little turn around room - would
have to back out propelled by hands.  It was no more than a meter
across, pretty regular round.

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Geoff10 Feb 2010 19:15
>> Just a reminder. I'm sure it will give us all a lot to blather about
>> here ...
>
>Was pretty good.  In the shakedown dive they cross a layer of hydrogen
>sulphide (?) and find the body of a diver from the 1970's (no guide
>line, little gear for the depth...)

I didn't see the hydrogen sulfide layer in the shakedown, it wasn't
mentioned until later in the program. I'm surprised they didn't
mention any effort to recover the body.

>Max depth was 320', rebreathing, about 4 hours (if I got all that right,
>they didn't get into the minutiae very much, alas)
>
>Tons of gear with bottles worn on their sides and smaller bottles on
>their backs.

The big-bottle dives were open circuit. They were blowing way too many
bubbles for rebreathers. Two big bottles on either side and nothing on
the back except the bracket says OC. They had more open-circuit video
than rebreather video. They did have some interesting rigs there.

>Fellow kisses his re-breather before sealing it in its can ...
>
>Not for me.

Nice machine, good machine, treat me well. Blessings of the lord
Darwin be upon us. :)

>I could see going into a largish cave (always room to turn around
>everywhere) for a reasonable straight-ish line for a 100 meters or so,
>but that would be more than enough.

100 meters is a lot of overhead distance for a beginning caver.

Alan Browne10 Feb 2010 03:41
> Just a reminder. I'm sure it will give us all a lot to blather about
> here ...

Was pretty good.  In the shakedown dive they cross a layer of hydrogen
sulphide (?) and find the body of a diver from the 1970's (no guide
line, little gear for the depth...)

Max depth was 320', rebreathing, about 4 hours (if I got all that right,
they didn't get into the minutiae very much, alas)

Tons of gear with bottles worn on their sides and smaller bottles on
their backs.

Fellow kisses his re-breather before sealing it in its can ...

Not for me.

I could see going into a largish cave (always room to turn around
everywhere) for a reasonable straight-ish line for a 100 meters or so,
but that would be more than enough.

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Alan Browne07 Feb 2010 22:51
Just a reminder.  I'm sure it will give us all a lot to blather about
here ...

Who's gonna watch?

(I'm recording it on my PVR as well).

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