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
These days, some warships have what’s called a NIXIE system. They have like a 1000-foot cable sticking out the back of the ship when they feel like torpedos are a potential threat, and at the end of the cable is an emitter that simulates a ship’s propeller noise. Basically it makes torpedos think that the ship is faaaar bigger than it is, and so the torpedo aims for the middle of the “ship” and just detonates hundreds of feet away from the actual ship.
Not quite chains sticking out, not quite nets, and not quite poles, but it works.
[https://en.wikipedia.org/wiki/AN/SLQ-25_Nixie](https://en.wikipedia.org/wiki/AN/SLQ-25_Nixie)
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