I’ve always thought a navy ship could have arms extending from each side, out say 20′ or so that holds some sort of draping system, like a chain or something, that extends below the bottom of the hull. Then, if a sub fired a torpedo at it, it would either explose on the chain or just get caught up in it.
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So it was said in older posts but I’ve got a bit of experience with this and want to add some things,
With modern torpedos, a net isn’t going to stop them, nor will a chain. Furthermore, with Submarines in your area, having a chain clanking around while you’re trying to avoid them would do the exact opposite- like screaming while playing hide and seek. There are countermeasures like anti-torpedo-torpedos and jammers, but really the best way to avoid getting hit by one is to be vigilant. Most countries use a combination of shipboard sensors and submarine hunting helicopters that go out a distance and use what’s called “dipping sonar” or they use planes to drop “sonar bouy” fields to find and sink enemy submarines in the areas near the ship first, or at least track them and make it so that if they did shoot, they’d be dead before their torpedo hit. Not to mention if it’s something like a convoy of ships, they probably have a submarine with them to defend against other submarines, along with helicopters, planes, towed sonar arrays, and intelligence that tells them if there are subs in the area before they even get there.
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