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Originally Posted by BulSoldier
If thats the case guess what happens if on one of the sides of the dc is not water but the pressure hull.
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There will be water between the Wabo/DC and the pressure hull unless the two are literally touching. What happens then is that the water doesn't compress and your pressure hull takes the full brunt of the explosion. The ratio generally used is that one kilogram of high explosive is 1.5 to 2.0x more effective submerged in water when detonated than when detonated in air.
Since your pressure hull is already under pressure from the environment, you taking the sledgehammer blow that is a close Wabo/DC detonation will result in catastrophic rupturing of the pressure hull longitudinally and vertically, in short as if you were to kick a half-inflated football (soccer ball). That dent left by your foot is what happens to the pressure hull. However, in the case of a DC/Wabo detonation at depth, the affected bulkheads will collapse inwards followed by the entire ocean trying to get inside the pressure hull.
Death of all hands is essentially instantaneous. We're all familiar with what happens when it isn't, the Russian submarine "Kursk" being the most recent example. Very unpleasant.