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.
In: 3375
Its called a [torpedo net](https://en.wikipedia.org/wiki/Torpedo_net) and it was a thing, but only when ships are in port or otherwise not moving. You could either put a big thick net across the harbor or [around a specific ship](https://maritime.org/doc/netsandbooms/img/pg064.jpg)
The nets provide a significant increase in drag so they’re no good when underway, they’ll slow a ship wayyyy down and it’ll burn way more fuel attempting to drag them around and it makes the ship way more vulnerable to anything that isn’t a torpedo
The mobile version is a torpedo bulge which is a big blister on the side of the hull with layers of air/water/oil to dissipate the blast before it damages the core hull of the ship. This has a pretty minimal impact on overall speed and weight if designed in from the start, and could also be retrofitted onto existing ships
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