Blast radius in water doesn't work like blast radius in air, and anyway it doesn't matter, which is why it's so hard to find data. Water is extremely incompressible so the blast of a torpedo is essentially all directed up, where the force can be used to lift water (easy) instead of compress it (hard). This is why a spout of water shoots way up into the air when a torpedo goes off. Even depth charges, dozens of meters down, will form water spouts, even though the depth charge can only damage a submarine within a few meters. It's also why the magnetic torpedo trigger is more effective than the impact trigger, because most of the force always goes up.
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