Re: Scrapheap challenge - salvage diving


"Sofa - Spud" <comfysofas@xxxxxxxxxxxxx> wrote in message news:g48rg1$gh9$2@xxxxxxxxxxx
michael adams wrote:
"Sofa - Spud" <comfysofas@xxxxxxxxxxxxx> wrote in message
news:g48kl1$l8q$2@xxxxxxxxxxx
Schrodinger wrote:
"Sofa - Spud" <comfysofas@xxxxxxxxxxxxx> wrote in message
news:g48hme$a5p$1@xxxxxxxxxxx
Not watched this for a long time but they had to get stuff off the bottom
of a deep indoor pool. One team made a diving helmet thing and
compressor - but the pool seemed very deep.


6 metres - 18 feet. Not deep at all.

Freedivers, i.e without aqualungs regularly dive to 100 metres and more.



It seemed awfully risky -
anyone know how deep the pool was and how long he could use the helmet
before bends would set in?

It would have to be *very* deep for there to be a risk of the bends.


How deep when not holding your breath but breathing through a tube?




"The bends" is a symptom of decompression sickness which affects certain
parts of the body when the whole body is subject to pressurised air, as in
a full diving suit or working in a deep tunnel. Basically when bodily
fluids are subjected to high pressure and then rapidy depressurised
gas bubbles can form in veins etc. leading to all sorts of nasties.

So no problems with the pressure on the body yet the lungs breathing
compressed air in the helmet?


By the time the water pressure was so high as to cause him problems he'd have
probably frozen to death already.



Like another poster I wasn't too happy about the ending of this, the first one
I've seen in a couple of years.

a) Although the air bag trick was neat enough, the winning team didn't really
make a machine at all. As has been said. They just employed a diver.

b) The cannon which looked heavy enough to sink their little boat didn't
seem to be that heavy at all.

c) It was stretching it a bit that they just "happened to find " a patchable
boat, and a working compressor so easily, without which they would have been
sunk. The other team started from scratch and made everything themselves
from bits.

d) A real test would have been landing the stuff off the craft onto the
side of the pool. Not having the cannon half hanging off the back of the
boat, while one of the team touched the side at the other end.

Most unsatisfactory IMO.


michael adams

....







As only matey's head was pressurised its likely the pressure on his
bodily fluids would have equalised themselves out at whatever depth.

The reason deep sea divers use pressurised suits is that they'd freeze
to death wearing only a wet suit and helmet below a certain depth.

Cold is the biggest killer in water, as water is such a good conductor
of heat.


michael adams









.

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