As a former submarine officer, I’m firmly of the belief that, in a real shooting war, surface ships wouldn’t last long. Surface ships today are not just vulnurable to modern nuclear subs, they are sitting ducks.
[QUOTE=Raguleader]
Yeah, subs are sneaky, and most surface ships quite vulnerable to them, but it’s worth noting that there are lots of tricks for locating them.
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None of which are particularly effective, especially if you don’t know where to start looking. It’s very difficult, for example, to keep ASW aircraft on station indefinitely.
[QUOTE=Raguleader]
I’ve heard that one trick is to use a satelite to literally look for a hole in the water (since it is now supposedly easier to see where the water isn’t than where the sub is).
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Satellites have trouble finding surface ships, much less a submarine. Big ocean, small ship. And looking for a “hole in the water”? :dubious: Cite?
[QUOTE=Raguleader]
ASW aircraft also have various gadgets for spotting subs underwater, including air-dropped sonar bouys and an EM-detector that looks for the variation in the local magnetic field caused by a large metal object lurking underwater. While many of these are dependent on surface ships for support, many aren’t.
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But again, unless the aircraft has an initial datum to work off of, it’s just like looking for a needle in a haystack.
[QUOTE=Raguleader]
As was mentioned before, the US and NATO have a large system set up for looking for enemy subs…
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You are likely referring to the SOSUS network.
[QUOTE=Raguleader]
…and if things were getting to such a state that war with a major naval power was imminent, we’d probably have our own attack subs lurking around, shadowing their subs…
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Probably. 
[QUOTE=Raguleader]
…(and they may very well have their own subs trying to shadow ours; during the Cold War, there was more than one instance where a Russian sub was being tailed by an American sub which was being tailed by another Russian sub).
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Cite? Let me just say such a situation is not just unlikely, but virtually impossible, given the manner in which we conduct submarine tracking.
[QUOTE=Raguleader]
The beginning of large-scale hostilities would probably be punctuating by a whole bunch of ships a’sploding at once, as subs opened fire on the ships they were shadowing. It’s possible that whichever nation had the least stealthy subs would lose their subs first.
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I agree.
[QUOTE=Raguleader]
That said, any large-scale naval war versus an enemy with a large fleet, submarine or otherwise, would get pretty ugly pretty fast, though it’s worth noticing that large surface battlegroups never go anywhere without a wolfpack of attack subs and various ASW surface ships to protect them with.
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Another thing to to keep in mind is the vulnurability of a carrier battle group to nuclear attack.