OT: Missing Titanic Sub

Rokodesh

Heisman
Aug 30, 2007
15,524
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I know what you're saying. These Coast Guard and Navy people are being paid anyway (as they should be). But I would think there are a lot of extra expenses being incurred here aside from that.

To me, it's no different than somebody trying to become the ten billionth person to be escorted up Mt. Everest. Good for them, but unless they're doing something constructive, or at least not super-risky with no good reason, I don't really feel that great about financing a search when things go wrong.

I guess I'm not very nice...
Seek help..
 

RUTGERS95

Heisman
Sep 28, 2005
26,649
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"Just sit right back and you'll hear a tale, a tale of a woke *** twit,
Who took his clients money, then he squished their *** to bits....."

too early lol
 
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brgRC90

Heisman
Apr 8, 2008
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RU4Real

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Jul 25, 2001
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But why seal it?
In my experience (literally only watching movies), couldn't they have the door be held shut from the inside with a bar or something similar to other submarines?
Then it could be opened from the inside if need be.

Why the bolt shut?

At 13,000' the pressure is nearly 400 atmospheres or about 5800 psi.

Submarine hatches do seal in place, opening outward and shaped rather like a cork. They can only be opened from the inside (security measure) but when they're "dogged" shut the seal is as watertight as it needs to be for a vessel whose operating depth is less than 5% of the depth of the Titanic.
 
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RuSnp

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Jan 14, 2004
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"Just sit right back and you'll hear a tale, a tale of a woke *** twit,
Who took his clients money, then he squished their *** to bits....."

too early lol
Politics is boring but to me this is really an issue of seriousness. You either respect mother nature enough or you don't and if you don't there seems to often be a reckoning. Contrast the videos of this ceo, the craft itself etc with something like this. To me it is night and day the level of seriously trying to derisk a situation as best you can. Sadly to me these folks picked the wrong horse.
 
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WhiteBus

Heisman
Oct 4, 2011
39,360
21,742
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Today is Thursday but Navy sonar heard the implosion Sunday and didn't say anything???
Nobody, any country, listens to undersea noise 24/7. It recorded and available on events like this. The crew of the submarine didn't report the disconnect communication for 12 hours so the Navy and Coast Guard were playing catch up. The Navy and CG new days ago but waited for confirmation to announce publicly. Explains why they didn't want the British sub to come. They have known the outcome for days.
 

ashokan

Heisman
May 3, 2011
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Cameron compares sub to Titanic.
In both cases careless stewardship invited needless tragedy.
Personally I'm glad Navy wasn't involved.
The dive in international waters allowed for cut corners.
If people want to go miles down into the dark deep in a hooptie sub they should do it not expecting to put rescuers at risk.
Plus Navy ships crash into each other despite mutual detection two hours away.

"As a design weakness in the Titan submersible and a possible cautionary sign to its passengers, Mr. Cameron cited its construction with carbon-fiber composites. The materials are used widely in the aerospace industry because they weigh much less than steel or aluminum, yet pound for pound are stronger and stiffer. The problem, Mr. Cameron said, is that a carbon-fiber composite has “no strength in compression”— which happens as an undersea vehicle plunges ever deeper into the abyss and faces soaring increases in water pressure. “It’s not what it’s designed for.”

 
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CERU00

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Feb 10, 2005
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Cameron compares sub to Titanic.
In both cases careless stewardship invited needless tragedy.
Personally I'm glad Navy wasn't involved.
The dive in international waters allowed for cut corners.
If people want to go miles down into the dark deep in a hooptie sub they should do it not expecting to put rescuers at risk.
Plus Navy ships crash into each other despite mutual detection two miles away.

"As a design weakness in the Titan submersible and a possible cautionary sign to its passengers, Mr. Cameron cited its construction with carbon-fiber composites. The materials are used widely in the aerospace industry because they weigh much less than steel or aluminum, yet pound for pound are stronger and stiffer. The problem, Mr. Cameron said, is that a carbon-fiber composite has “no strength in compression”— which happens as an undersea vehicle plunges ever deeper into the abyss and faces soaring increases in water pressure. “It’s not what it’s designed for.”

Exactly right... carbon fiber composites are used for their tensile strength (fan blades for example), not for parts that experience compressive forces. That's really fundamental. I was assuming the actual pressure vessel had a metal body... i cant fathom the possibility the actual chamber was relying on carbon fiber.
 

RU4Real

Heisman
Jul 25, 2001
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Cameron compares sub to Titanic.
In both cases careless stewardship invited needless tragedy.
Personally I'm glad Navy wasn't involved.
The dive in international waters allowed for cut corners.
If people want to go miles down into the dark deep in a hooptie sub they should do it not expecting to put rescuers at risk.
Plus Navy ships crash into each other despite mutual detection two hours away.

"As a design weakness in the Titan submersible and a possible cautionary sign to its passengers, Mr. Cameron cited its construction with carbon-fiber composites. The materials are used widely in the aerospace industry because they weigh much less than steel or aluminum, yet pound for pound are stronger and stiffer. The problem, Mr. Cameron said, is that a carbon-fiber composite has “no strength in compression”— which happens as an undersea vehicle plunges ever deeper into the abyss and faces soaring increases in water pressure. “It’s not what it’s designed for.”


My belief is that the CF as a structural member was fine. I'm interested in the flanges between the CF cylinder and the titanium end caps. Seems to me those two substances would have different compression rates as pressure increases. I'm wondering how you bond that flange without stressing it with every dive.
 

LETSGORU91_

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Jan 29, 2017
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I already said they should have vetted the company better.

That doesn't make the activity itself insanely unfathomable and extreme the way people are acting.
Engaging in an activity where basically zero percent of the population has ever gone, at depths almost 400x the atmospheric pressure, in vessels which only a dozen vessels in the world can transport passengers, and in one not designed or certified for those depths isnt extreme??? Hold on a second.

Reaction Lol GIF by MOODMAN
 

RULoyal

Heisman
Jul 28, 2001
14,884
17,606
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Exactly right... carbon fiber composites are used for their tensile strength (fan blades for example), not for parts that experience compressive forces. That's really fundamental. I was assuming the actual pressure vessel had a metal body... i cant fathom the possibility the actual chamber was relying on carbon fiber.
Hadn’t that submersible been down to the Titanic twice already?
 

fsg2_rivals

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Apr 3, 2018
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Engaging in an activity where basically zero percent of the population has ever gone, at depths almost 400x the atmospheric pressure, in vessels which only a dozen vessels in the world can transport passengers, and in one not designed or certified for those depths isnt extreme??? Hold on a second.

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As a customer and passenger?

Maybe for you.
 

yessir321

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Sep 26, 2018
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Hadn’t that submersible been down to the Titanic twice already?
I think they said like 12 times over the last 2 years. Each time is probably additional stress on the structure and are they doing proper maintenance checks all along? I don't know.
Watch this interview with James Cameron about it. He explains in a simple way why it doesn’t work. Essentially that over time the water itself breaks down carbon composite material.

 
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MoreCowbellRU

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Jan 29, 2012
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The search isn’t really costing any money. What else would these people be doing? Mopping the decks for the 75th time in a day?
Rescuing folks in peril is realistically their entire reason for existing. Same as first responders on land.

People crack me up with this who's paying nonsense. We're you all OK with mobilising every asset on the east coast to find JFK Jr's plane when he decided to fly in a plane and conditions he was not qualified for?

I saw it first hand. You would have thought Martha's Vinyard was being invaded.

Be consistent folks
 

RUBlackout7

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Rescuing folks in peril is realistically their entire reason for existing. Same as first responders on land.

People crack me up with this who's paying nonsense. We're you all OK with mobilising every asset on the east coast to find JFK Jr's plane when he decided to fly in a plane and conditions he was not qualified for?

I saw it first hand. You would have thought Martha's Vinyard was being invaded.

Be consistent folks
People really think the Navy is going to have to ask congress for additional funding to pay this magical bill 😂
 

RUinBoston

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Aug 17, 2006
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I think they said like 12 times over the last 2 years. Each time is probably additional stress on the structure and are they doing proper maintenance checks all along? I don't know.
Yeah this is probably the key. When you go rock climbing you are supposed to count every time you fall, and when you have fallen a certain amount of times you have to suck it up and buy a new rope, since the rope is only proven to withstand the pressure a certain number of times. This sub was clearly able to withstand the pressure a certain number of times....
 
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RUTGERS95

Heisman
Sep 28, 2005
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the good thing is that while they may have known something was wrong with the sub, they certainly felt no pain or even knew the implosion happened. The speed of the implosion at those depths is much faster than the 25milliseconds it takes for your brain to process something.

saving grace I suppose
 

kupuna133

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Jul 13, 2015
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Watch this interview with James Cameron about it. He explains in a simple way why it doesn’t work. Essentially that over time the water itself breaks down carbon composite material.


The biggest flaw was hubris. Carbon composite failure will be to blame, but it was the excessive pride and arrogance of the leadership team that lead to this tragedy.
 
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MoreCowbellRU

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Jan 29, 2012
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Watch this interview with James Cameron about it. He explains in a simple way why it doesn’t work. Essentially that over time the water itself breaks down carbon composite material.


I agree with him that carbon fiber is not the correct material for a vessel exposed to compressive forces.

That said, I AM NOT going to base any life and death decisions based on what James Cameron says. There are far better qualified folks to ask these questions.
 

mildone_rivals

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Dec 19, 2011
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The news articles all report that the implosion detection wasn't considered definitive enough to halt the search. However, I suspect the Navy was certain early on, but was hesitant to reveal that they knew because doing so would lead to questions about intelligence capabilities.

We'll probably never know this, or many other details, for sure. But if the Navy was confident in what it now says it heard (the implosion) and confident that it could only be the submersible causing that sound, then that would explain the US telling the British recovery vehicle to stand down rather than deploy to the area.

The existence of US underwater detection capabilities is, as @RU4Real said earlier, an open secret. But the exact details of that capabilities are not something we want to advertise. I imagine lots of higher-level discussions took place about what could be publicly disclosed and when.

IMO, the US probably shouldn't have given out the information that they heard the implosion at all. Not even to the onsite search team. The debris would eventually be found anyway. National security trumps easing the uncertainty of the victim's families. And national security priorities dwarf the public's desire to "know stuff" about such events.
 
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RUTGERS95

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Sep 28, 2005
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I agree with him that carbon fiber is not the correct material for a vessel exposed to compressive forces.

That said, I AM NOT going to base any life and death decisions based on what James Cameron says. There are far better qualified folks to ask these questions.
well those folks weren't on scene due to diversity considerations

aside from gluing the CF to the hull, manually ratcheting the tube shut, nothing being certified or going through any kind of QA, and the litany of other issues one could describe, no one needs James Cameron to say 'don't do this' ha

all deep dive submersibles go through vast checks on a schedule and it's clear this didn't happen here. The hubris and lack of situational awareness here is astounding. This is an epic fail on so many levels and yet, seemingly intelligent persons paid larges sums to do this. mind blowing

going to the moon is easier than diving the depths of the oceans
 
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