Surviving deep depths
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Archived from the IMDb Discussion Forums — Goliath Awaits
ranc1 — 2 years ago(June 28, 2023 04:07 PM)
After Titan tragedy, there is all the chat that humans cannot survive the deep sea depths such of Titanic.
For those who do not know it - ocean depths are dangerous and cold.
Even though they are deep - there are strong currents, similar to hurricane winds that whirl objects around which can be dangerous if you sniff around some sunken ship with many things to get stuck or bump onto.
After 1000 meters there is no sunlight. It is pitch black. From 300 meters and deeper - the pressure becomes too dangerous for humans. There is physics of compression - where objects will get shrunk. If there is sudden break into the shielded submersible - there is a physical process/phenomena called implosion which means that deep pressure of water is crushing any air that is trapped and exposed to water at deep depths. There is also phenomena where trapped air - once exposed to the pressure will heat up - almost to the temperature of Sun's surface - however for now I have not find how this phenomena is called in physics.
So even if someone somehow survives in air pocket in sunken ship/submersible - there are all kinds of threats: implosion, explosion, nitrogen poisoning, and even hypothermia.
Yet..
in real life - there are news like this:
"
USS Thresher’s Crew May Have Survived Many Hours After Its Disappearance According To New Docs (Updated)
Declassified reports from one of the submarines that were looking for the Thresher suggest some of its crew may have survived the initial incident.
BY
THOMAS NEWDICK
|
UPDATED JUL 15, 2021 1:07 PM EDT"
"
a newly unclassified report indicates that one submarine sent to search for it thought that at least some of the crew were still alive around 24 hours after the vessel was determined to have imploded.
"
Source: TheDrive
Depth of Titanic wreck: 12,500 feet (3.8 kilometers) below sea level.
Depth of USS Tresher wreck: 8,400 feet below the surface on the sea floor (2.5 km) -
️ Christina 1986-05-20 
— 2 years ago(June 29, 2023 04:00 PM)That's me as a kid! Now, I paddle down deep depths!
Are you horny???
½ S/N Asian (40%+ Chinese) ½ Norwegian/Danish-Irish Swiss (Amish/PA) German French Dutch? French+Dutch Celtic-Irish English-Irish?
..? -
MovieManCin2 — 2 years ago(June 30, 2023 11:25 PM)
As with every dive, I came up slowly and stopped at 15 feet as a safety measure. Most decompression takes place in the last 15 feet. After the dive I recorded my maximum depth and time elapsed, and then consulted the
Navy Dive Tables
. I then calculated when I could go down again, and how deep I could go. The deep dives were always the first one of the day, so we would have time to decompress completely before our next dive(s).
It was always several hours before we could dive again. The deep dive was in the morning. We would then return to base and have lunch. We would resume diving at the appropriate time and to the appropriate depth in the afternoon.
We always stayed within the parameters of the Navy Dive Tables, and never had any problems. And of course, we had to become
certified
before doing any dives.
It's a fascinating experience, the closest most of us will ever come to weightlessness. But then I got closer several years ago when I took a ride on the Zero G Plane
(aka the vomit comet),
and experienced true weightlessness. That was a
amazing!
ab_channel=InterestingEngineering
MAGA! FAFO!
Schrodinger's Cat walks into a bar, and doesn't. Dumbocraps: evil people who celebrate murder. 
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ranc1 — 2 years ago(July 01, 2023 01:38 PM)
Whoa!
IT is fascinating.
I still do not understand this part:
" I came up slowly and stopped at 15 feet as a safety measure"
What does that mean?
That you just float in the water for some time and wait there doing nothing?
That is the decompression process/stage? -
MovieManCin2 — 2 years ago(July 02, 2023 06:27 AM)
It is! You should try it some time.
Meanwhile, back at scuba diving, you ascend from your dive using the anchor line of the boat as a guide. You then stop at approximately 15 feet under the surface, and hang onto the anchor line for two minutes. And yes, you do nothing. If you didn't hang onto the anchor line, you would tend to bob to the surface.
Decompression takes place from the moment you begin your ascent until you break the surface, but most of it takes place in the
last 15 feet.
The stop at 15 feet is just an
extra safety step
just to be sure you didn't ascend too quickly.
Note:
to be sure that you
don't
ascend too rapidly, you simply don't go up any faster than your air bubbles.
MAGA! FAFO! Schrodinger's Cat walks into a bar, and doesn't. Dumbocraps: evil people who celebrate murder. -
ranc1 — 2 years ago(July 02, 2023 11:30 AM)
" to be sure that you don't ascend too rapidly, you simply don't go up any faster than your air bubbles.
"
Whoa.
Thanks for data, this is interesting stuff.
Nope, I don't think I'll ever try it - it is interesting to learn about it though. Water has its own rules as if it's some alien planet. -
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ranc1 — 2 years ago(July 01, 2023 01:45 PM)
" once exposed to the pressure will heat up - almost to the temperature of Sun's surface - however for now I have not find how this phenomena is called in physics."
By the way,
Thanks to twitter community, I discovered how this phenomena process is actually called. It is:
"Adiabatic Heating"
"
Changes in temperature caused by the expansion (cooling) or compression (warming) of a body of air as it rises or descends in the atmosphere, with no exchange of heat with the surrounding air.
"
Apparently, in case of submersible being penetrated by water and its pressure, the temperature will not cause explosion (after the implosion), neither it will scorch everything - the high temperature will simply quickly dissipate.
