A lesser-known military fun fact is that helicopters actually hard-counter submarines. Once the general location of an enemy sub is discovered, they can just drop sonar buoys to get its precise position and then drop artillery on it from the sky. The sub can’t do shit back because it’s hard to find anti-aircraft weapons that work underwater.
Incorrect, subs have a very simple defense; they can dive beneath the thermal boundary layer, which reflects & distorts active pings, along with hiding them from passive sensors near the surface.
After that, if attacked, they have all manner of decoys and ECM suites countering a wide variety of sonar.
Granted, being found by an ASW helo is still bad, bad news.... but it's not a death sentence.
This is why the Navy is working hard on laser weapons - they have effectively infinite ammo and can be used to disable helicopters from underwater.
False. They're for surface combatant missile/drone defense, not subs.
Lasers don't work well underwater due to diffusion and a multitude of other factors not found in the atmosphere, except at extremely close range, and even then only for distance estimation/targeting in ROVs and mini-subs. Even if they had a point-defense system, the cavitation of a torpedo being vaporized and/or exploded at close range would be as dangerous.
Also, conventional warheads decrease massively in effectiveness with depth, and modern subs can dive deep enough that even a near miss wouldn't be catastrophic, as it would near the surface.
This is one of the reasons the Russians developed supercavitating torpedos; essentially underwater missiles. They act as both a kinetic kill vehicle while also carrying a large warhead. Subs can still dodge weapons with a max speed of 70-80kts, not so with ones that travel at 300kts..... literally.