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Scuba Forum / UK Scuba / December 2004

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Whales take a hit

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Dave Appleby - 24 Dec 2004 08:27 GMT
BBC News article on Whales and DCI

http://news.bbc.co.uk/1/hi/sci/tech/4122119.stm

And there was me thinking Whales were the worlds greatest
(Sorry Nigel it's not you) freedivers.

Am I missing something obvious?

What size tank does a Sperm whale need?

I was under the impression DCI's (Well in this case anyway)
were caused by compressed gas.

Learn something new everyday :-P

DaveA
Keith Manning - 24 Dec 2004 08:48 GMT
"Dave Appleby" <dave_appleby@yahoo.com> wrote in message

Interesting. But maybe they can get bent because the depths that they go to
are so much deeper than any SCUBA depth. It might be a whole new set of
rules down there.

I know somebody who swears that he was bent freediving. I suspect that he
was regular diving before this but all the same interesting.

Am I right in thinking that any microbubbles in the bloodstream will be
recompressed and have a chance to clump together to form a bubble that will
expand upon ascent?

Keith
CAS - 24 Dec 2004 09:16 GMT
> "Dave Appleby" <dave_appleby@yahoo.com> wrote in message
>
[quoted text clipped - 10 lines]
>
> Keith

I remember posting a while back that I'd seen some theoretical work done
that suggested that it was perfectly (theoretically) possible to bend a
freediver.

It involved some pretty silly profiles and timescales but was "do-able".

As I promised before, if I come across the magazine, I'll post more.

CAS
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http://divesite.calumscott.me.uk

Gordon Henderson - 24 Dec 2004 15:17 GMT
>> "Dave Appleby" <dave_appleby@yahoo.com> wrote in message
>>
[quoted text clipped - 16 lines]
>that suggested that it was perfectly (theoretically) possible to bend a
>freediver.

The chap who got the 103m record in Cyprus earlier this year has had some
symptoms that might be like a bend... After his deep dive, he wanted to
go down to 6m and breathe some of our O2 for a while (which was OK by us)

Gordon
Nigel Hewitt - 24 Dec 2004 09:58 GMT
> BBC News article on Whales and DCI
> http://news.bbc.co.uk/1/hi/sci/tech/4122119.stm
[quoted text clipped - 3 lines]
>
> Am I missing something obvious?

Something that can hold enough oxygen in its tissues to
power that many tons of muscle on a hunting expedition
for lasting ever so long and eerso deep is going to have
problems several orders of magnitude more than a breath
hold diver.

Bone lesions I can believe as once the pressure is on
deep gas will transfer about the body and bones being
a long t/c compartment will be candidates for a hit
and on a fast ascent (you bet a whale can do a really
fast ascent if they overcooked it chasing dinner and
the alternative is drowned whale) anything is at risk.

nigelH
CAS - 24 Dec 2004 10:13 GMT
http://jeb.biologists.org/cgi/content/full/205/9/901/i

I knew I read something about penguins too...

CAS
Steve Jones - 24 Dec 2004 13:33 GMT
Dave I read the title and thought you had advance knowledge of the rugby
results.

Steve.
Dave Appleby - 24 Dec 2004 14:40 GMT
> Dave I read the title and thought you had advance knowledge of the rugby
> results.
>
> Steve.

Oh..

Has the usual blind optimism taken a hit this year????

DaveA
 
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