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Message
re: Missing Submarine
Posted on 4/23/21 at 2:28 pm to LeroyBrown
Posted on 4/23/21 at 2:28 pm to LeroyBrown
quote:
Missing Indonesian submarine. Tough way to die.
If it went to crush depth, it would be almost instantaneous, they wouldn’t have known what hit them. If the hull ruptured at a deep enough depth the crew would be incinerated by the burst of superheated air that occurs when the air in the sub’is redder vessel is almost instantly increased to the outside seawater pressure.
0
Posted on 4/23/21 at 2:45 pm to soccerfüt
quote:
Let me get this straight, they’ve lost ANOTHER submarine?
That is ABSOLUTELY the first thing I thought of!
Posted on 4/30/21 at 10:25 pm to LeroyBrown
quote:
JAKARTA/BANYUWANGI - A strong underwater wave might have been what caused an Indonesian submarine to descend quickly and sink to a depth of 850m in the north of Bali last week, killing all 53 crew members on board.
Two senior naval officers said the movement of a strong internal wave in the spot where the submarine was reported missing was on the image report of Japanese weather satellite Himawari-8 as well as a European one.
Internal waves, or underwater waves, are hidden entirely within the ocean. The difference between an underwater wave and the water around it is their densities because of different temperatures or salinity.
"If we are hit by an internal wave (coming from above), that would be nature we are up against. We would be dragged by the waves, sending us to a quick descent. No one can fight nature," said Rear-Admiral Iwan Isnurwanto, a former submariner, during a media briefing in Jakarta on Tuesday (April 27).
The commander of the Navy Staff and Command School explained that there is a seawater density difference between the Lombok Strait and the much deeper waters in the north of Bali, where the KRI Nanggala-402 submarine was found.
On April 21, the day of the accident, there was a massive movement due to density difference - from high to low - that spawned an enormous internal wave coming from Lombok Strait, between 200m and 400m deep, to waters in the north of Bali, where the depth is generally more than 1,000m.
Rear-Adm Iwan, citing the satellite image report, said: "We are talking about 2 million to 4 million cubic m of water hitting you. Could anyone overcome that? The Nanggala submarine descended 13m and could have been caught in the internal wave.
LINK
Posted on 5/1/21 at 8:00 pm to Jim Rockford
frick this is sad Submarine crew sings farewall song
Posted on 5/1/21 at 8:04 pm to Jim Rockford
Wow
Posted on 5/1/21 at 8:49 pm to mattz1122
Reports said it broke into three pieces. I can understand crushed, single rupture, breaking into two pieces. I just don't understand three pieces.
Posted on 5/1/21 at 8:58 pm to real turf fan
Water rushes in, compresses the air in the sub which mixes with the auxiliary diesel fuel. When it reaches a critical mass it explodes outward. This all happens in less than a second. The investigation board determined this was what happened to USS Thresher.
Posted on 5/1/21 at 9:00 pm to blueridgeTiger
The US and Alaska don’t frick around.
Posted on 5/1/21 at 9:08 pm to Jim Rockford
Did we know what had destroyed the Thresher before the ship was found? Or was it multiple working hypotheses that all had a bit of the answer?
Posted on 5/1/21 at 9:10 pm to Jim Rockford
How do other subs negotiate this kind of event?
Posted on 5/1/21 at 9:16 pm to LeroyBrown
quote:
But, why does Indonesia need a submarine to begin with? Just curious.
they are the 4th largest country in the world. tbh, they have more of a need to protect their borders than we do.
Posted on 5/1/21 at 9:18 pm to real turf fan
It was a test dive with a support ship that was communicating with it. They immediately knew something was wrong and that it exceeded its test depth but not exactly what until they surveyed the wreckage. IIRC the reactor scrammed for some reason, they couldn't restart it in time and it sank below crush depth. There was also an issue of faulty welds in the plumbing system that may have contributed but the main cause was the inability to restart the reactor. The chief engineering officer was on leave due to a family emergency and his replacement was inexperienced.
Posted on 5/1/21 at 9:30 pm to real turf fan
quote:
Reports said it broke into three pieces. I can understand crushed, single rupture, breaking into two pieces. I just don't understand three pieces.
When the hull ruptures at depth, the water doesn't come in as a jet slowly flooding the sub like they show you in the movies. It is violent and the water basically moves as a wall through the "unbroken" parts of the sub. Think of it like the stopper in a syringe when you press the plunger.
It almost instantly destroys everything in front of it. Massive steel bulkheads turn to shreds when they're hit. Since it's moving like a plunger in a syringe through the sub, the trapped air in front of it gets compressed. The air heats up like the air in a bike tire when you pump it up, but so much so that it gets to hundreds of degrees or hotter and anything combustible is instantly incinerated right before the wall of water hits it and crushes it into bits.
Finally, the water itself slams into the inside of the hull when it reaches the end of the sub. Just like water moving in a pipe when you suddenly shut a valve, the seawater hammers the inside of the submarine and generates a massive pressure spike that can be many times the hydrostatic pressure of the sea rushing into the submarine. Basically, the massive momentum of the moving water is turned into static pressure when it suddenly reaches the end of the sub and stops. And, just like a piping system subject to water hammer, the hull of the sub far from the initial rupture can be ripped open and split by the massive pressure spike from the water hammer, breaking it into more than two pieces.
This post was edited on 5/1/21 at 9:38 pm
Posted on 5/1/21 at 9:30 pm to RogerTheShrubber
quote:
Didn't Argentina lose one a few years ago?
The hedge fund that bought all the government bonds probably grabbed it as soon as it surfaced.
Posted on 5/2/21 at 12:00 am to RazorBroncs
quote:
And you always find them the last place you look
Isn’t this the case with anything you look for? Duh
Posted on 5/2/21 at 12:14 am to Deep Purple Haze
Lots of prayer rugs were found in the wreckage
Posted on 5/2/21 at 12:33 am to Jim Rockford
To be clear:
The “Farewell Song” video from the crew was recorded weeks before their death.
The “Farewell Song” video from the crew was recorded weeks before their death.
Posted on 5/2/21 at 3:56 am to Jim Rockford
For the Thresher:
Leading case, weld issue lead to seawater leak/flooding case and electrical short resulting in reactor scram. Procedures at the time did not allow for fast startups (so any attempt to restart would have taken several hours). Procedure also required isolating the steam system completely upon reactor scram, so the result is nearly a complete loss of propulsion,
When you’re taking on water you need forward speed to be able to maximize the effectiveness of the planes, which requires a reactor.
Additionally, compressed air that’s used to “emergency blow” the main ballast tanks had too much moisture, resulting in freezing of the air lines when the crew tried to emergency blow to the surface.
Leading case, weld issue lead to seawater leak/flooding case and electrical short resulting in reactor scram. Procedures at the time did not allow for fast startups (so any attempt to restart would have taken several hours). Procedure also required isolating the steam system completely upon reactor scram, so the result is nearly a complete loss of propulsion,
When you’re taking on water you need forward speed to be able to maximize the effectiveness of the planes, which requires a reactor.
Additionally, compressed air that’s used to “emergency blow” the main ballast tanks had too much moisture, resulting in freezing of the air lines when the crew tried to emergency blow to the surface.
Posted on 5/2/21 at 6:30 am to BRIllini07
quote:
Additionally, compressed air that’s used to “emergency blow” the main ballast tanks had too much moisture, resulting in freezing of the air lines when the crew tried to emergency blow to the surface.
Which led to SUBSAFE and Parker check valves. I remember many times beating the frick out of those things with a rubber mallet to get them to re-seat. Good times...
Posted on 5/2/21 at 6:34 am to Jim Rockford
quote:
It was a test dive with a support ship that was communicating with it.
Doing our first deep dive on a new construction sub was one of the more tension filled moments of my life.
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