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Oceangate Statement, “We now believe that [all crew] have sadly been lost.”

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Re: Oceangate Statement, “We now believe that [all crew] have sadly been lost.”

#51

Post by pugworthy »

rightbyte wrote: post #45
saberdancer wrote: post #18

Earlier quoted context omitted.

Their bodies are also pressurized at 1 atms, after being exposed to 400 atms they instantly died. My guess is that they were effectively vaporized/liquified. Much better way to go then suffocate in darkness.

Why are people assuming this? How about a leak that fills the sub with water? Is a leak impossible to keep stable at those depths?

A slow leak that filled the sub would not necessarily have lead to the vessel's destruction.

That said, you can get leaks. I participated on a research cruise with a French submersible, and there was talk of small leaks with the main hatch seal occurring during descent. The "fix" was to go deeper so the pressure would essentially seal the hatch shut.

Re: Oceangate Statement, “We now believe that [all crew] have sadly been lost.”

#53

Post by npunt »

GoToRO wrote: post #37
jacquesm wrote: post #27

Earlier quoted context omitted.

Yes. The founder is on record as saying that he thinks safety is wasteful or something to that effect and many other choice quotes besides. https://www.google.com/search?q=stockton+rush+quotes

[flagged]

Nominative determinism strikes again, sadly

https://en.wikipedia.org/wiki/Nominative_determinism

Re: Oceangate Statement, “We now believe that [all crew] have sadly been lost.”

#54

Post by lazide »

routerl wrote: post #34
andrewmunsell wrote: post #19

Earlier quoted context omitted.

There's obvious differences between the Oceangate sub and this (1 atm difference, this is a thinner steel(?) railroad tanker not a sub), but I think it effectively demonstrates how violent and quick an implosion would be: https://www.youtube.com/watch?v=Zz95_VvTxZM Video contents: An experiment where the vacuum safety valves were removed from an oil tanker railroad car, and a vacuum was placed inside the car, resulti…

The sub wasn't steel, it was a carbon fibre weave. The tiniest crack would have caused catastrophic shattering of the hull. For every ten meters of descent, pressure increases by 1 atmosphere. At 4000 meters, that's 400 atm, or ~40 Mega Pascals, which is significantly higher than the pressure caused by the bomb that leveled a building in Oklahoma. The hull shattered catastrophically, and the pressure wave liquified t…

Yup - and if someone had been inside the tank in that YouTube video they’d likely have been dead almost instantly too when it imploded. (Even if we forget about the vacuum)

Probably the fastest and least painful way to die, short of sitting on a 2000 lb bomb or the like when it goes off.

Re: Oceangate Statement, “We now believe that [all crew] have sadly been lost.”

#55

Post by ilyt »

ceejayoz wrote: post #38
saberdancer wrote: post #18

Earlier quoted context omitted.

Their bodies are also pressurized at 1 atms, after being exposed to 400 atms they instantly died. My guess is that they were effectively vaporized/liquified. Much better way to go then suffocate in darkness.

It's a good guess. https://en.wikipedia.org/wiki/Byford_Dolphin > Investigation by forensic pathologists determined that Hellevik, being exposed to the highest pressure gradient and in the process of moving to secure the inner door, was forced through the crescent-shaped opening measuring 60 centimetres (24 in) long created by the jammed interior trunk door. With the escaping air and pressure, it included bisection o…

I tried to find [1] how much pressure explosion of a grenade would cause. It would take a lot of grenades to get to 400 atmospheres...

- [1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5514183/#:~:tex...

Re: Oceangate Statement, “We now believe that [all crew] have sadly been lost.”

#56

Post by SV_BubbleTime »

jonah wrote: post #30
Natsu wrote: post #9

Well, this explains a lot... they didn't have a window rated for the right depth and weren't really testing whether the hull was de-laminating according to the whistleblower, so we have a few guesses as to why the sub would just implode. The lack of contact would be because nobody was alive to contact, which is honestly better, at least they had a quick death instead of slow suffocation. And the banging noises are pr…

In the press-conference they said both end bells were found separately - no mention of whether the window was still intact. It'll be interesting to see the failure analysis. [Edit] Link to video with a description of the major debris found: https://youtu.be/A0xJ220Fod4?t=263 "the front end-bell of the pressure hull - that was the first indication that there was a catastrophic event" "the aft end-bell which basically.…

Sounds like if the bells were found, but not the tube, we have the answer.

If the window failed, I would expect to have none or one bell separated from the tube, but not both. I imagine the glass being shot inside the tube and the water jet would vaporize the people inside and maybe blow one bell off.

If the tube failed, would expect both bells to be sitting on the ocean floor.

I’m not a professional mechanical engineer, just a guess.

Re: Oceangate Statement, “We now believe that [all crew] have sadly been lost.”

#57

Post by ChildOfChaos »

Natsu wrote: post #9

Well, this explains a lot... they didn't have a window rated for the right depth and weren't really testing whether the hull was de-laminating according to the whistleblower, so we have a few guesses as to why the sub would just implode. The lack of contact would be because nobody was alive to contact, which is honestly better, at least they had a quick death instead of slow suffocation. And the banging noises are pr…

The sub would have imploded long before they were monitoring for noises, so it's something completely different.

Re: Oceangate Statement, “We now believe that [all crew] have sadly been lost.”

#58

Post by masklinn »

paulddraper wrote: post #4

"The Titan began its descent Sunday to explore the wreckage of the Titanic, located about 13,000 feet below sea level in the North Atlantic Ocean, with an estimated 96 hours of life support. The expedition was billed as “a chance to step outside of everyday life and discover something truly extraordinary” and cost each participant $250,000, an archived version of OceanGate’s website shows. "However, the cramped vesse…

> The ocean is very, very deep. The Titanic is "relatively" shallow, only 3800 feet below sea level

It's 3800 meters, 13000 feet as you wrote in the first paragraph.

Nothing shallow about 3800m deep, that's abyssal plains level, it's basically the bottom of the "normal" ocean (the abnormal ocean being the hadal zone of the trenches). It's a land of no light, little to no oxygen, and literally freezing cold.

Re: Oceangate Statement, “We now believe that [all crew] have sadly been lost.”

#59

Post by lazide »

fnord77 wrote: post #26
tedivm wrote: post #15

Earlier quoted context omitted.

Someone on reddit did out the math- they were crushed before they had any idea what happened.

but your brain is in fluid and fluid isn't compressible much at that pressure

The extremely rapid pressure change would shred everything into fine pulp instantly.

Re: Oceangate Statement, “We now believe that [all crew] have sadly been lost.”

#60

Post by TechBro8615 »

ceejayoz wrote: post #38
saberdancer wrote: post #18

Earlier quoted context omitted.

Their bodies are also pressurized at 1 atms, after being exposed to 400 atms they instantly died. My guess is that they were effectively vaporized/liquified. Much better way to go then suffocate in darkness.

It's a good guess. https://en.wikipedia.org/wiki/Byford_Dolphin > Investigation by forensic pathologists determined that Hellevik, being exposed to the highest pressure gradient and in the process of moving to secure the inner door, was forced through the crescent-shaped opening measuring 60 centimetres (24 in) long created by the jammed interior trunk door. With the escaping air and pressure, it included bisection o…

That wiki page describes a decompression injury, which AFAIU is the opposite of implosion:

> This resulted in the chamber being explosively decompressed from a pressure of nine atmospheres to the one atmosphere of the unsealed chamber system.

Whereas an analogous description of the submarine implosion would describe the opposite, i.e. "explosively compressed from a pressure of one atmosphere to 400 atmospheres."

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