I disagree with your analysis of water as far as explosives are concerned. Perhaps I was not clear. I was speaking of explosive yield of the warheads in TNT, not the technical weight.
Regardless, you are wrong about pressure effects on high explosive.
First of all, I have considerable working knowledge with explosives. And the crazy part about water, is because of that very incompressibility you were talking about, water transmits explosive energy EXTREMELY efficiently. Almost perfectly. (This is because water molecules are packed so tightly together, that they don't need a lot of energy to transmit from one to the next.)
This means, that in effect, the shockwave from an explosion diminishes, you'll have to excuse me, but mathematically in an expanding spherical rate from the origin of the blast. Almost perfectly geometric. In contrast, there is very little diffusion of the blast from the medium, unlike in air.
Because of this, a torpedo would only have to "Be in the ballpark" literally, to have potentially huge shock effect on a target torpedo.
I can't believe those transducers on a torpedo could possibly survive even a relatively far "near miss", and guidance wires could easily be severed or damaged by an explosion in the target torpedo's wake.
They are small targets, but they are VERY NOISY passively, and easy to track operating at high speeds, cavitating as badly as most do.
(I'm sure there are stealth torpedoes, but that's another topic entirely.)
The explosive (Mk48 ADCAP equivalent to 1/2 TON of conventional TNT... Remember, this 488 lbs of explosive is more modern and efficient. I'll leave it at that.) is MORE than capable of damaging or destroying another torpedo within a wide lethal range.
(DO YOU HAVE ANY IDEA WHAT A 1/2 TON OF TNT WOULD DO TO ANYTHING WITHIN 100 METERS OF IT UNDERWATER???)
(Or is this why seawolf has 8 tubes...)
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