781–790 of 1001 posts
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“Mass shootings”, as in the people who were shot had mass. Redefining mass shootings to conveniently include gang violence really dilutes the term to meaninglessness.
Why is it not a mass shooting if a gang is involved?
Do you think that gang violence and what we traditionally call “mass shootings” have the same underlying causes and represent a similar level of risk to the public?
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At that depth, the pressure is quite intense - around 6000 psi. That means 6000 pounds pr square inch - that's almost a Ford F150 truck pr square inch, everywhere. And now imagine how many square inches the surface area of a human is - especially your upper torso where your lungs are located. The sub (hull) is made of a carbon fiber and titanium mix - and I'm not sure how that would react, if it buckles / collapses l…
depending on the failure type (shear, compression, tension) carbon fiber behaves differently. but when the fibers actually break it pops so quickly that it exceeds human perception. real time view of tensile failure: https://youtu.be/gmMRPmEYWhU high speed 10m fps view of tensile failure: https://youtu.be/OePpVwCvCZg when compressed along an axis that's not properly reinforced by carbon fibers, it will just disintegr…
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More than that, one report mentioned the US Navy notified the search teams that they heard an explosion Sunday night and used it to limit the search area. The US Navy has literally has experience detecting underwater explosions (see project Azorian). It's not guaranteed of course, but any loud sound near the point of contact loss seems pretty open shut. Imo, it made a more interesting story in a slow news cycle. How…
If the explosion was heard Sunday night wouldn’t this mean there’s a possibility the crew was stuck for some time and knew they were likely going to die?
So, at 4000m you're looking at something between 4500 5500 psi. Thats a small truck worth of pressure every square inch in the hull. Once you breach the structure, think crushing a tin can in the middle, things collapse pretty fast.
As do bodies. If you figure your body is 2 foot by 6 foot, the pressure would be like parking 100 fully loaded 18 wheelers on a single body within a split second of each other.
Every book or encounter you read about submariners has a section talking about the creaking of the bulkheads and wondering how long it can hold because it's such a nature defying act to build something that can hold that pressure out in the first place.
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At that depth, the pressure is quite intense - around 6000 psi. That means 6000 pounds pr square inch - that's almost a Ford F150 truck pr square inch, everywhere. And now imagine how many square inches the surface area of a human is - especially your upper torso where your lungs are located. The sub (hull) is made of a carbon fiber and titanium mix - and I'm not sure how that would react, if it buckles / collapses l…
Would you wager they died faster than the time it takes for a bullet fired into a head to cause death? The water moves faster than a bullet?
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In an interview with James Cameron, he mentions[1] that he and other submersible industry experts believe that the system worked and that they did in fact have warning, as they had dropped the weights (which were found far away from the debris field) and were attempting to resurface before the implosion: [1]: "This Oceangate sub had sensors on the inside of the hull to give them a warning when it was starting to crac…
Just fucking insane. In aerospace everyone knows that when a crack starts, IT'S OVER. Crack propagation is extremely rapid after that once nucleation has occurred. Your only hope is to prevent nucleation sites in the first place. Except it's extremely hard to characterize fatigue limits without tons of testing and even for metals there is wide variation for identical parts, not even getting into composites. Which of…
There may have been monitors that detected structural issues in the hull (nucleation above), but at the pressures that the Titan was operating at, the amount of advanced warning is likely very, short--_maybe_ a second or two, if that. Probably not enough time to notice and reduce the pressure on the hull in any meaningful way.
The slow-motion porthole cracking you see in movies like "The Abyss" is a fiction created by Hollywood for dramatic effect. The reality is far more likely to be like water freezing in a pipe: everything is fine until it isn't.
The pressure the pipe exerts on the water inside of it keeps the water in liquid form until the temperature drops below the temperature/pressure equilibrium (~10F/-12C for residential copper pipe in the US). At that moment, the super-cooled water transitions from liquid to solid virtually instantaneously. .
The pipe analogy is the opposite of what would happen in the submersible: the pipe explodes due to internal pressure, instead of implodes due to external pressure. But the pressure going from sustainable to unsustainable in very short order is the same.
what will the insurance payout look like? will there be one to the victims?
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More than that, one report mentioned the US Navy notified the search teams that they heard an explosion Sunday night and used it to limit the search area. The US Navy has literally has experience detecting underwater explosions (see project Azorian). It's not guaranteed of course, but any loud sound near the point of contact loss seems pretty open shut. Imo, it made a more interesting story in a slow news cycle. How…
If the explosion was heard Sunday night wouldn’t this mean there’s a possibility the crew was stuck for some time and knew they were likely going to die?
The pressure differential is large. As soon as the hull gives way it's essentially like a bomb explosion in reverse.
I suppose it's possible that some external piece of the sub might have exploded and left the sub itself stranded but intact on the ocean floor. However, it seems that's not what happened -- pieces of the sub's main body were part of the floating debris field.
It provides some level of comfort to know that the passenger's demise was likely instant as opposed to slow and terrifying.
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So many things about this venture were not really considered. I am terrified that this guy was an aerospace engineer. It feels like he threw the book about engineering safety out the window. The big one is designing the sub to travel to 95% of the expected maximum depth, leaving a 5% margin of safety. I was taught to aim for a margin of safety of (I think it was) 50% back in the day. Operating so close to the safe li…
There ... there were screws into the structual carbon fiber??
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600 refugees drowned in the mediterranean and the captain of one of the non profit rescue vessels operating in the mediterranean is facing 20 years in prison. barf.
While on principle I agree. It doesn't matter. There can be 2 problems at the same time. Whatever people focus on shouldn't be a topic. Edit: That seems far more callous than it was meant. You're right, people are forced to travel the sea almost daily, desperate people will do anything. This IS different. And hits different because it was a choice, with a real discussion about "Hey, it's really possible you can die,…
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“Mass shootings”, as in the people who were shot had mass. Redefining mass shootings to conveniently include gang violence really dilutes the term to meaninglessness.
I'm not sure what's "convenient" there (or, conversely, what's "inconvenient" about dismissing gang violence), but there has always been squabbling over MCIs. From Wikipedia: > A mass casualty incident (often shortened to MCI) describes an incident in which emergency medical services resources, such as personnel and equipment, are overwhelmed by the number and severity of casualties.[1] For example, an incident where…