"All of Vlad's forces and all of Vlad's men, are out to put Humpty together again." (8 Viewers)

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Russia does not want peace. Russia wants land. A peace deal would cap that war aim.
 


Yeah, the underwater explosion needn't contact the hull to cripple or sink the boat. Water-hammer can do the trick, and historically has, against subs.
 
Thumpalumpacus said:
Yeah, the underwater explosion needn't contact the hull to cripple or sink the boat. Water-hammer can do the trick, and historically has, against subs.
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And, like on aircraft, the area aft of the rear pressure bulkhead is much "weaker" as it does not need to withstand the high pressure differentials that the pressure vessel does. Outside the pressure vessel the only loads are manoeuvring so it only needs enough strength to deal with that.

Inside the pressure vessel on an aircraft the pressure load is typically around 8psi which is 1150 lb/sq ft or 10,300 lb/sq yd.

Submarines have a vastly greater pressure differential. At 100 ft/30m the pressure differential is just over 3 atmos or 44psi. Wiki says Kilo subs can go to 300m where the pressure is going to be ten times that - ie 30 atmos/440 psi. It takes a very strong structure to withstand those pressure differentials.

I would be surprised if the sub was not seriously damaged.
 

My understanding, and definitely subject to correction, is that the sub was docked, meaning that the water pressure was 1AT until you get below 15'. But even without the atmo pressure, water doesn't start to compress until around 30,000 psi, which makes it an excellent conductor of pressure waves.

If so, some of the explosive pressure surely vented to the surface and dissipated, but once that shock wave is ten foot below the surface, it's going to hurt that sub. It's the same reason that near-misses onto ships in WWII were at times fatal. Water is very unforgiving.
 
MiTasol said:
It is way out of my expertise but the shock wave rebounding off the pier onto the sub would, I expect, be significant as well. I would think the effect of the pressure wave on the fins to create a very significant twisting moment as well.
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I hadn't even considered either of those two points, and they're likely important as well.
 
Do not forget the propeller. It is difficult to see just how close the origin of the large blast is to the rear of the sub, but the sudden shock wave & pressure on the propeller would result in both torsional stresses (ie trying to turn the prop) and linear stresses (ie trying to shove the prop towards the sail). Having external forces trying to spin the prop from 0 rpm to ? rpm almost instantly is problematic even on submarines where you figure there is some sort of resilience built into their systems. It is also possible that some stresses were transmitted to the final drive gearing (assuming such exists) and/or to the electric low-power / low-speed motor. I wonder if the thrust bearings and/or blades could take the stresses.

The submarine that had the small explosion near the tail had been moved by the 16th, but the submarine with its tail near the large explosion had not been moved. Why?
 
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I do not think they have enough subs to do that. It may be the one with the smaller explosion is easy to repair or has sprung a leak so was moved to a repair location. It may also mean the other is so badly damaged that they are not willing to move it or are keeping it there to feed the lie that it was not damage. Or they are not willing to move it because that would show it needed repairs. There are just too many options even before you add vodka.
 
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