I'm not thinking so much about security clearances as much as the basic laws of physics.
Sonar, unless we're talking about the mine-hunting sets who are capable of imaging, is an imprecise sensor at the best of times. The only operational anti-torpedo systems known, the US Mk46 Mod 7 and the Russian UDAV-1, are designed to create barrage explosions near the threatened ship as a last-ditch effort to stop the incoming torpedo, exactly because they are not precise enough to impact near it otherwise.
What you and that game describe is more akin to long-range ABM-like interception. I'd like to see some hard figures indicating that even the best US sonars are capable of generating precise enough targeting data for such a feat.
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