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wilderthanmild posted:My dumb theory: While I don't know this for sure as I haven't seen any detailed specs for groversub, pretty much every other commercial submersible built has an emergency deballast system of some kind. Its normally a manual mechanical linkage that will drop the heavy main battery or other ballast weight out of the bottom, making the submarine positively buoyant causing it to rapidly rise to the surface. The advantage of these systems is that they will work without power, propulsion or electrics of any kind. Once the sub gets to the surface it should have a S/EPIRB (Radio beacon) that would point rescuers right to it, and hopefully it would have hard points to crane in on to the deck of a ship. This sub seems very poorly designed, so who knows. I think the hull failed catastrophically. 4000m is about ~400 atmospheres of pressure, or ~5800PSI. Thats a lot of pressure
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Jun 20, 2023 03:55
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| # ¿ May 12, 2024 12:52 |
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biznatchio posted:
Assuming they have lithium hydroxide curtains in their survival gear, they will run out of oxygen long before they freeze (the curtains use a chemical process to effectively convert CO2 to heat, and are standard sub survival stores)
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Jun 20, 2023 04:17
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Death By SnuSnu posted:That may be a big assumption. So far they have yet to show that they researched or followed any standards for operating a submarine. Very true, but I just watched that CBS news clip posted up thread and the flypaper strips the reporter who had previously done a trip was describing are the curtains. I had a sad lol at having to roll the sub to deballast with lead pipes though. I'm assuming there was a second emergency system but maybe not.
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Jun 20, 2023 04:26
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Bad Purchase posted:there wasn't even a periscope on this thing, how you gonna even call it a submarine? Correct! If you want to get technical it's a submersible, not a submarine.
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Jun 20, 2023 04:33
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Even if by some miracle they manage to find the submersible intact on the ocean floor, good luck trying to recover it from there. Also finding a bottomed out submersible of that size is very difficult even with modern side scanning sonars.
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Jun 20, 2023 14:24
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wilderthanmild posted:Yeah, basically their best scenario at this point is they were instantly killed when the pressure vessel failed. Every other scenario is a nightmare. Oh for sure. For us in military subs only like less than 5 % of the world's oceans was in recoverable waters, which I didn't mind so much at the time because in any other scenario it would be quick. We had rescue stores, rations, and a USN certified docking and escape tower and I still didn't like our odds of being rescued.
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Jun 20, 2023 14:30
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Of course it's not a real toilet. THAT would require real engineering work, not to mention a lot more power and weight requirements for any kind of marine vacuum heads system. And then you'd need a water and holding tank too, because you are not drawing from or trying to eject out to the outside.
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Jun 20, 2023 17:05
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verbal enema posted:How much does it take to build like a modern military sub? 20 million or some poo poo? Why do they not just base a design on those? I know ultra modern military poo poo you cannot get specs for but cant you base it on some older ones that didnt gently caress up or suck and at a minimum was just a big coffin at the worst Couple hundred million for a conventional attack sub all the way to many billions+ for a new nuclear SSBN
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Jun 20, 2023 17:20
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Ralph Crammed In posted:I don't know if they are over the phone, I may have misunderstood what the guy said, but when he said text messages I thought phone. They may have a more sophisticated system? Or not. Does anyone know? Text messaging and phone communication won't work under water. Unless they were tethered to the mothership. Radio and Sat phone on the surface, sure, but the only way to communicate underwater that deeply is acoustically. Or the miles long ELF arrays they use to give launch commands to nuclear missile subs (probably not even that as I think it's too deep) The battery comment is a good one though, it wouldn't take much to a small short or electrical fire to make the atmospher unbreathable within a few seconds. Do you think they have any emergency breathers? Me neither.
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Jun 20, 2023 18:12
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Also a cylindrical design for a submersible that goes that deep is a terrible decision and there is a reason why all other deep diving submersibles are spheres. It works for military subs because they are much shallower vessels comparatively. Here's what a cool looking non grover version looks like: https://tritonsubs.com/subs/gullwing/?dc=pro
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Jun 20, 2023 18:22
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Bad Purchase posted:it did have INS, so the operator on board would've had some idea where / how deep they were, but it lost comms with the surface. this was apparently expected and happened on a previous dive, but in that case contact was regained when they began to surface at the end of the dive. Fun fact, INS is fine for open ocean nav but most navies don't rely on it for dived navigation once you get closer to shore. Current Ring Laser Gyro / Fiber Optic units are orders of magnitude better than the older mechanical ones but they still drift too much to rely on as a sole positional source. Different countries call it different things, but most dived navigation is done with an expanding oval, based around your last gps fix, and your dead reckoned position and speed. The calculation of which is based on a number of factors including your speed and time underwater between gps fixes. The sub is considered to be anywhere within that expanding oval, not necessarily where the INSs are saying you are. INS doesn't tell you how deep you are, you've got a pressure/depth sensor for that.
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Jun 20, 2023 23:26
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| # ¿ May 12, 2024 12:52 |
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Bad Purchase posted:you sure INS doesn't tell you depth? do they make special ones for ocean use that aren't 3-axis? i'm a bit familiar with their use in aviation (not super versed, i've worked on software that collects that data stream from a GPS/IMU, but don't really know all the math that goes into combining them into a final result), but i know it worked in all 3 axes. I mean in theory INS could, but no one does because of the error accumulation with INS systems. It's far safer and more accurate to use a pressure based depth sensor. Keep in mind a RLGN system can drift 3000 yards with 30hrs of removing the GPS fix and still be "in spec" for most navies. In depth terms that's way past crush depth errors.
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Jun 21, 2023 00:00
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