Even if someone went through all the troubles of getting an accurate mapping of the ocean floor modeled in SH3 it would be of little value to the player. Since escorts have sniper precision accuracy with their depth charges hiding in an underwater canyon or the bottom actually works against you; where even today it is still a sounds tactic.
If you bottomed your boat at say 240m the escort above may toss a few more salvos down but would only have your last known position as a good fix. Once on the bottom the sonar of that day couldn't distinguish between a submarine on the bottom or a giant rock. Granted if you made noise to give yourself away you are now a stationary target with a big bullseye. Regardless, the moment you stop moving and become stationary with active sonar you're as good as dead. The dc attacks will become deadly accurate and may only take 1 or 2 more salvo's before you're hull collapses.
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