Titanic tourist sub missing

[jeremyp]

Again, it could well be inside something that was recovered with the main structure of the vessel. I'm not saying it's likely, but it's not impossible.

That's a good point. The sub had some external cameras and they probably partly survived. Of course, they would have been pointed away from the sub and therefore not recorded the implosion.

Also, there is a probability that at least one of the passengers would have had a good camera on them - I would have done - and some part of the camera body might survive. Unfortunately, they may not have been recording the descent.

 

[SpuriusMaximus]

Considering that again, the implosion happened in less than 1ms, I wouldn't have high hopes of anything actually recording it. If a camera records, say 30 frames per second, that's 33ms per frame. It would be all ok in one frame, gone in the next.

Unless, I suppose, they had some of those 2000 fps cameras, but I can't imagine any reason for that.

 

[Gord_in_Toronto]

A somewhat fawning, and not too highly accurate, summary of the whole sorry expedition here:



The comments are not exactly complimentary.

 

[zooterkin]

Considering that again, the implosion happened in less than 1ms, I wouldn't have high hopes of anything actually recording it. If a camera records, say 30 frames per second, that's 33ms per frame. It would be all ok in one frame, gone in the next.

Unless, I suppose, they had some of those 2000 fps cameras, but I can't imagine any reason for that.

Who said anything about recording the implosion itself? A voice recording was mentioned, which might show if they had some warning if they spoke about it, or if some unexpected noises were recorded before the failure of the vessel.

 

[MRC_Hans]

Again, it could well be inside something that was recovered with the main structure of the vessel. I'm not saying it's likely, but it's not impossible.

After a heavy mechanic shock and 300 bar of seawater for several days? Well, not impossible, I suppose, but ....

Hans

 

[MRC_Hans]

A somewhat fawning, and not too highly accurate, summary of the whole sorry expedition here:



The comments are not exactly complimentary.

Requires barf bags to watch.

Hans

 

[jeremyp]

A somewhat fawning, and not too highly accurate, summary of the whole sorry expedition here:



The comments are not exactly complimentary.

Yeah, sorry. I got three minutes in before I had to stop.

As a complementary video, I watched some of this yesterday:



The commentary is bad almost to the point of incomprehensible in parts but it mentioned that, in 2023, they were towing the submersible behind the support ship instead of keeping it on the deck and craning it off for the dives. The reason for this is conjectured to be that they couldn't afford a more capable ship.

 

[The Man]

If the joining epoxy is cured in an autoclave, then you have even more thermomechanical stresses when it's at the temperature of the sea. Carbon fibre composite apparently has a wide range of possible coefficients of expansion, including this website saying that some can be negative. It's almost certainly going to be different from both the glue and the Titanium. Likewise their response to pressure.

Always pluses and minuses in any production method, particularly one with elements of dissimilar properties. Even when it’s still carbon fiber. Just the differing laminates laid up are going make the thermomechanical properties broad just by themselves. As your link notes the weaker molecular forces tend to be in the Z direction. So that’s where you’re going to get most of your shifting by dislocation. All the more reason to try to limit interlayer motion available in the Z direction.

Again I’m no CF expert but limiting motion in the Z direction by compacting the composite structure as much as possible in the autoclave while curing would be my first thought. Also the cyclic wear as the laminations move in the Z direction they are going to rub past each other as their diameter (and thus circumferences) expand and contract potentially at very different rates. That introduces shear stress between layers and the the potential of fretting damage to the carbon fibers as they slide past each other. Perhaps the noises herd, like plucking a harp string on a very large harp (like the Blaster beam^WP) but with a file (or wire saw) where both end up damaging the other and the sustain of the sound being almost non-existent. So very direct and sharp but reverberating in hull like the body of a guitar or violin. Again I’m not a CF expert, didn’t even play one on TV and haven’t stayed at a Holiday Inn Express for over a decade.

 

[The Atheist]

A voice recording was mentioned, which might show if they had some warning if they spoke about it, or if some unexpected noises were recorded before the failure of the vessel.

What the hell is th...

 

[zooterkin]

What the hell is th...

Apparently the most common last words on black box recorders are "Oh Sh-"

 

[SpuriusMaximus]

Who said anything about recording the implosion itself? A voice recording was mentioned, which might show if they had some warning if they spoke about it, or if some unexpected noises were recorded before the failure of the vessel.

Yes, but what would it even tell you, given that it imploded in less than 1/33 of a frame? "Oh, this thing is creaking, but Rush says it's no..."

I mean, it might be evidence for the lawsuit, sure, but won't really tell you much about the implosion

 

[theprestige]

Apparently the most common last words on black box recorders are "Oh Sh-"

That seems highly implausible, given the kinds of pilots and the kinds of planes that get paired with black boxes.

 

[novaphile]

Here's another video of two small carbon-fiber models with metal end caps imploding in a pressure chamber. This video has a high-speed camera view of the inside of the chamber which is able to show in detail how to carbon fiber fails.

Less black corn flakes than I was expecting.

 

[novaphile]

Apparently the most common last words on black box recorders are "Oh Sh-"

Yes.

After the pilots have tried everything and everything has failed, there's often a quietly spoken 'Oh Sh-' as the realisation sinks in.

Can be very hard to hear amongst all the beeps, boops, whistles and sirens of the various cockpit alarms and mechanical voices saying: "Terrain, terrain, terrain." and "Pull up. Pull up. Pull up." and the mechanical stick shaker vibrating the controls.

Cockpit voice records can be harrowing things to listen to.

 

[Gord_in_Toronto]

Yes.

After the pilots have tried everything and everything has failed, there's often a quietly spoken 'Oh Sh-' as the realisation sinks in.

Can be very hard to hear amongst all the beeps, boops, whistles and sirens of the various cockpit alarms and mechanical voices saying: "Terrain, terrain, terrain." and "Pull up. Pull up. Pull up." and the mechanical stick shaker vibrating the controls.

Cockpit voice records can be harrowing things to listen to.

From my memory the one I always think of is the case where, as the aircraft was landing, the co-pilot deployed the spoilers while the plane was still a few hundred feet above the ground, whereupon the aircraft dropped like as stone to the runway. The last words were those of the pilot forgiving the co-pilot for his mistake.

Ah. After a Google. The full story here:

Air Canada Flight 621

I got the main details correct for something that happened 53 years ago. But the captain's last words are not mentioned.

 

[Gord_in_Toronto]

And, I suppose things like this are to be expected:

Was 7-Year-Old Cancer Patient Denied Make-A-Wish Gift Due to Titanic Submersible Search Funds?

 

[jeremyp]

From my memory the one I always think of is the case where, as the aircraft was landing, the co-pilot deployed the spoilers while the plane was still a few hundred feet above the ground, whereupon the aircraft dropped like as stone to the runway. The last words were those of the pilot forgiving the co-pilot for his mistake.

Ah. After a Google. The full story here:

Air Canada Flight 621

I got the main details correct for something that happened 53 years ago. But the captain's last words are not mentioned.

The captain's last words were either "we've got an explosion" or "we've lost a wing" depending on whether it was him or not who said the latter.

https://tailstrike.com/database/5-july-1970-air-canada-621/

 

[Gord_in_Toronto]

The captain's last words were either "we've got an explosion" or "we've lost a wing" depending on whether it was him or not who said the latter.

https://tailstrike.com/database/5-july-1970-air-canada-621/

Thanks for the link. I shall reset my memory bank. It was a cool story though.

 

[TellyKNeasuss]

I've seen a couple of articles that quoted people with inside information as stating that the Titan attempted to surface and had jettisoned ballast weights, e.g.,

https://www.msn.com/en-us/news/us/t...p&cvid=c578180527e748b0bd96bef9020529b2&ei=30

I also read an article (which I can't find right now) about a European (I believe Italian) expert who theorized that the Titan lost power and because the weight of the passengers was concentrated near the view port it rotated to nose down, causing it to descend faster than usual, and that the increased speed of descent would have been enough to cause the difference in response to increasing pressure between the view port and the rest of the hull to become large enough to cause microscopic cracks to develop.

 

[newyorkguy]

More about those weights. A retiree from California named Bill Price went on a Titan dive in 2021. As reported in the New York Times:

During the descent, Mr. Rush realized that Titan had lost its propulsion system on one side. He aborted the trip, Mr. Price said. But he could not get what he called the “drop-weight mechanism” to release ballast for the ascent, as designed, Mr. Price said. (In a video interview with Alan Estrada, a Mexican social media influencer, Mr. Rush explained the ballast system, which included six 24-inch sewer pipes that weighed 37 pounds, “and we dump that pipe, one by one.”)

Mr. Rush calmly explained that the weights were loaded from the top with no stopper — so if they could rock the submersible enough, they would drop off. Everyone lined up in a row, rushed to one side, then the other, back and forth, to tip the Titan and dislodge the ballast, the way someone might rock a vending machine to free a candy bar stuck on a spindle. New York Times news link

It worked though, and Titan returned to the surface. They completed a successful dive the following day.

Reminds me of the time the Little Rascals built themselves a fire truck.

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