You can't go below a certain depth and/or go above a certain speed when firing these weapons. If you stay at 50m or above and 5 knots or below you usually will have no problem. But there are certain parameters depending on the weapon. I don't normally play using the Akula, but I think for Stallions you can use them as deep as 100m. Just look up what these parameters are and stay within them when firing these weapons.
Maybe you tried firing them at 10 knots or at 200m or something.
P.S. Oh yeah. For Harpoon and TASM stay at 150 feet or above and no faster than 5 knots for success.
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